CHANGE the DIFFERENTIAL FLUID in your C7 Corvette! ISSUES with the factory fluid! 😲

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🛢️ OEM differential fluid: amzn.to/32Z8YSx
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🏎️ The factory fill on the C7 Corvette (as well as other GM performance cars) is some nasty stuff. It doesn't cost much money or time to ensure that this fluid is never the cause of any rear end problems in the future.
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HorsePower Obsessed
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#HorsePowerObsessed #DifferentialFluidChange #C7Corvette #CorvetteZR1 #Corvette #ZR1 #Supercharged #CorvetteStingray #Manual #C7DifferentialFluid #HPO #ZTK

[@HorsePowerObsessed]

What do you guys think of the stock diff fluid in my ZR1? If you're interested in changing it yourself you can buy the OEM fluid here: amzn.to/32Z8YSx and the pump to get it into your differential here: amzn.to/37nKTsf 👍👍 The "how-to" portion starts at 3:11.

[@1mantisco]

I would go with AMSOIL

[@cassiespencer6134]

Good point. Unfortunately, that's what the rear differential fluid often looks like after several thousand miles. Mine has a little over 15,000 and I need to change it. GM generally claims ~ 30,000 miles, although 15 - 20K is considered better by others. That is due to the fact the ring and pinion gears in the differential see a lot of wear which results in microscopic metal particles, which is what you saw. Like I say, the more you know, the more paranoid, err I mean prepared, you should be. In this case that means changing the diff oil about every 15,000 miles or even more often depending on just how 'prepared' you are. ;)

[@anthonycastellano6017]

You said 3 qts needed but then when done said you used 3.5 qts

[@HorsePowerObsessed]

I misspoke. It was around 2 1/2 to 2.8 that it used so you’ll need 3 quarts overall.

[@mjdart54]

@@anthonycastellano6017 That's strange, it was trickling out the fill hole a 3 quarts on my change.

[@jimavenius136]

2019 Grand Sport. Built 10/2018. Dealer advised me to change mine at 1000 miles. Similar metallic look. Very common from gear break-in. More interesting...drained out 74 oz and put in 85 oz. Glad I changed it.

[@HorsePowerObsessed]

That was another issue I had heard about was underfilled differentials. Either way, I think it's semi cheap insurance to change this fluid out.

[@mjdart54]

Just finished changing my fluid, your video inspired me to go after this job. My drain & fill plugs had the exact little blue marks on them. I gotta say my fluid actually looked pretty good, but there was snot on the drain plug. At first the upper plug on my Z06 looked impossible to get at. It's amazing how after a short while you really adapt to getting after it. I had my car on jack stands, so it's a bit different from a lift. After draining and filling which was exactly 3 bottles of fluid before it began to lightly stream out of the top plug opening. I used a red Hopkins's siphon pump I got at at Lowe's Home Improvement for $14. That pump works fantastic. Thanks again for putting up this video.

[@HorsePowerObsessed]

You're quite welcome! I'm glad it helped! 👍👍

[@suengyim8421]

Thank you what you do for Corvette family.

[@HorsePowerObsessed]

You're quite welcome. Thank you for watching!

[@RustyZipper]

For a few more bucks I bought the “Slippery Pete” pump, a bit quicker the reviews said. Also I put the quarts of oil in a 5 gal pail of hot water to warm the fluid up and that helped tremendously

[@HorsePowerObsessed]

Ah! That's a good idea with warming up the fluid. I'll check out that pump as well. 👍👍

[@scottbarker9058]

ahhhh...juss...yep;throw it in-2 the micro-wave...

[@Team512]

Changing your diff fluid adds 37hp. 😂 Had a great time at the TeamFive12 Garage! Thanks for coming out. 👍 Glad I didn’t fall off of the roof. 😎

[@HorsePowerObsessed]

At least 37 horsepower!!! I'm glad you didn't fall off as well because we hadn't even started my differential fluid change yet and we obviously needed you! 🤣🤣

[@Team512]

@@HorsePowerObsessed lol😂

[@RustyZipper]

Only if you add an AC Delco sticker

[@HorsePowerObsessed]

What if you add three stickers? 😁

[@Team512]

​@@HorsePowerObsessed I think sticker added hp gains follow the law of diminishing returns...so even tho the affect of the 2nd and 3rd stickers would be reduced, the total net gain would exceed that of the first sticker...

[@FrontSeatDriver]

Definitely, everyone needs to go follow those guys as well! CarzGuyz and Team512!!

[@HorsePowerObsessed]

Agreed! Links in description!

[@Team512]

Front Seat Driver Thanks!

[@HorsePowerObsessed]

No problem! You guys both deserve it!

[@carzguyz5142]

I concur...lol. Thanks guys. Awesome being friends with you all. I'm all chocked up. Partly due to these turtle neck I'm wearing. It's too tight. Lol

[@devnull128]

NICE VIDEO! One note: You should drive the car a little (figure 8's) and then recheck the level. I've done many of these on C7's and 1LE's and sometimes it will take a few pumps after the run in. Also, that fluid is completely normal looking. I always do them at 1,500 miles and it always looks like that on the first change. It's a combination of metal as the gears run in and the clutch packs breaking in. Looks good!

[@HorsePowerObsessed]

Thank you. I will definitely do this come spring since I'm planning on changing it again then anyway.

[@devnull128]

Cole Lee Aerial - you are aware of you the e-diff works, no? Typical

[@Matty.Garage]

Nice man! Glad to see JT getting a lot of stuff done... he was the main piece of this tutorial! 🤣😂🤣.... good guys!! Love it

[@HorsePowerObsessed]

Thanks, Matt! Every person here had their job! 😁👍

[@Butterffinger5678]

Honestly, I believe the engine, transmission (and transfer case if equipped), and differential(s) should have their fluid changed at the end of the break in period, if not sooner, on new cars. For any used car, I am a firm believer in changing all fluids shortly after purchase.

[@HorsePowerObsessed]

I agree and will be doing the transmission (and differential again) come spring time. The oil has already been changed and will be again before storing for the winter.

[@xxuncexx]

3rd owner. My Vette ran on that Ugly gray matter for 45,000 miles!!! Recommend changing ASAP any Vette that hasn't had it done at least once above 1000 miles.

[@HorsePowerObsessed]

Agreed!

[@Tbob17]

Just had the diff fluid changed in my 15 z51. 8k miles....tech said it was very bad...thanks for the heads up....great info....tbob

[@HorsePowerObsessed]

Thank you! It definitely looks pretty bad at fairly low mileage and it definitely can't hurt to change it!

[@mjdart54]

Thanks for showing how easy that fluid change really is and also for links, I've got almost 10K miles on my Z06, that fluid change will be happening soon.

[@HorsePowerObsessed]

You're quite welcome! I definitely recommend doing it! Easy and cheap insurance!

[@thiosemicarbizidebenzoylal2921]

That's is most definitely metal ground up. I also hear GUNSHOTS in the video. This dude living near a gun range is scarier than the fluid though.😯 Another great info video, and you are simply becoming the leading expert on C7s by far. Not one other you tuber has provided this much info on the most underrated sports cars in history. There is five times as many C6 maintenance and performance vids.

[@HorsePowerObsessed]

Thank you! I appreciate that. He does live near a gun range, good ears.

[@Team512]

I’ve only been hit twice 🥴 Actually all ranges are pointing away from the house.

[@HorsePowerObsessed]

🤣🤣🤣

[@1mantisco]

Why is living near a gun range scary?

[@megaviper1999]

Wow fluid did look really bad. Thanks for sharing good info thumbs up Justin.

[@HorsePowerObsessed]

Thank you! Easy/cheap insurance to change it out even if it isn't "needed"

[@carzguyz5142]

Easy peasy J. Good job on this upload. Turned out way better than I thought. Close quarters under there. Didn't think we'd get clear shots of the process. Glad we were able to help bro. On behalf of T512 and myself, thanks for the shout outs. 😉👍

[@HorsePowerObsessed]

You are quite welcome! Thank you for helping out! 👍👍

[@texasrubicon392]

Great info. Yeah it looks like that black stuff is sealant. However... all that metallic crap in the fluid is pretty nasty. Maybe it’d be a good idea to get an extra three quarts, fill it up, spin the diff manually, then drain again. Then refill. Also... you can get a drill powered pump at a boating supply shop. It has one end that would go down the dipstick hole (to an oil pan), and another that discharges whatever you’re pumping, which would go in the diff.

[@HorsePowerObsessed]

Thank you. Great tip on the pump. I'll probably be changing this again next summer just to get any residual gross factory fill fluid out so I may grab that pump in the meantime.

[@joelpierce8891]

Change mine at 2900, mostly highway miles. Very little on the Plug magnets. It’s the break in fluid. Helps the Gears mate. I drained a little over 2 liters and put in 2.7 liters of the LS 75-90 GM fluid.

[@HorsePowerObsessed]

Definitely break in fluid. I wanted to get that out of there asap, though.

[@1216jimmyz]

Isn't there a clutch pack in the diff? That residue looks like shavings from that. Well that and mixed with gear oil.

[@HorsePowerObsessed]

There is, and it absolutely could be exactly that. It is just really nasty looking stuff. Like I said in the video, I'm by no means a professional but it just looked less like shavings and more like some sort of sealant.

[@1216jimmyz]

@@HorsePowerObsessed from building many quads and dirt bikes over the years, I've seen the same "goo" with the oil. Most likely it's the clutches breaking in inside the diff. They should recommend a change of fluid after a certain amount of miles.

[@1216jimmyz]

@Cole Lee Aerial umm, look up what the inside of a LSD looks like. You aren't wrong about the tranny, but you are wrong about the diff.

[@chasboland]

Great video, thanks for showing the “know how” to others that don’t feel confident doing this maintenance. Everything is ordered for my Z and will be done by weeks end. 🤘🏼

[@HorsePowerObsessed]

Glad it was helpful!

[@CCH7540]

The greyish black pasty stuff is likely clutch pack material. The ELSD in the C7 still has actual friction discs (four frictions per side and alternating steels). Like any friction assembly (brakes, clutch, diff etc.), they slip, wear, and shed some material in doing so.

[@garrenturk4093]

You just made me want a C7 Vette again(Grandsport manual to be more exact)..... I had saw that the C7s had rear diff problems and was NAHHH.... but thank you sir for detailing an easy fix

[@HorsePowerObsessed]

You're quite welcome! The C7 is an amazing machine!

[@garrenturk4093]

Yes sir IT IS INDEED

[@Sandy-oy2lr]

Had all the fluids swapped in my '13 C6Z at around 50Kmi. Clutch, coolant, PS, brakes, transmission (switched to Amsoil Signature Synth-huge difference in shift quality) and differential. It's really cheap insurance to get all that gear/clutch wear material out. Car makers want you to believe in 'Permanent Life No Change' fluids. But, it's a crock. I even changed the engine oil/filter after the first 1000 miles after it's break-in period. Just to get any worn material out from the break-in.

[@HorsePowerObsessed]

Agreed. It definitely can't hurt.

[@waltermiller249]

I only use Mobil 1 differential fluid. Use it for transmission fluid and oil too. Change my diff. fluid twice a year cause I drive it hard. Almost the same exact procedure for the c5 Corvette

[@HorsePowerObsessed]

It's pretty similar for all the Vettes I've noticed. I'm going to stick with what the owners manual calls for.

[@waltermiller249]

@@HorsePowerObsessed my owner's manual says Mobil 1 for the c5 Corvette. Would think Chevy would use something better for such a high end car. But then again they did put that slim in there from the factory

[@HorsePowerObsessed]

Yeah that factory fill is not pretty that's for sure. The Delco stuff seems to be pretty high quality, though and from what I've seen it's right up there with the best of the best.

[@gavsu]

i had the same issue with my 19 GS fixed it with new oil

[@mdcoomer67]

I had mine changed with the 500 mile oil change. It's cheap insurance against the horror stories I've heard about underfilled diffs, slimy crap coming out (like yours), and finding shavings way too late. $125 for peace of mind...priceless!

[@HorsePowerObsessed]

Exactly! I had mine done for the cost of fluid. About 50 bucks.

[@FrontSeatDriver]

JT is always so funny.

[@HorsePowerObsessed]

He really is. These guys were both a great amount of help in the video but you can always count on JT bringing the comic relief. 🤣

[@Team512]

I forgot that he crawled out from under the car...had me dying! 😂

[@HorsePowerObsessed]

Lol right?

[@rbatts9163]

Looks like anti seize or thread sealant on the plug . Great video Justin !

[@HorsePowerObsessed]

Thanks, Ryan! I thought the same thing on those plugs. I have no idea why it's so nasty after only 4k miles.

[@shawnsokol3546]

Great video and tips! Some say the differential should be changed within 1000 miles essentially after break in.The original oil didnt look that bad it will always be murky and the "Paste" on the drain plugs is micro fine metal particles.

[@HorsePowerObsessed]

Thank you. I actually plan on changing it again here soon along with the transmission fluid.

[@ericmutnan6358]

The grey goop is clutch material. Pretty normal. Just like a trans magnet, as long as there are no chunks you are good.

[@HorsePowerObsessed]

100% 👍👍

[@accuracymark]

That black greyish material is nitrate coating used to harden the pinion ring gear manufacturing process.

[@HorsePowerObsessed]

Thanks for the info. That sounds legit.

[@pjfan173]

Corvette recommends this done at 45,000 miles. I can't even imagine what the fluid would look like at that mileage. I'll definitely be getting mine done when I pull it out next spring with only 7500 miles on it.

[@HorsePowerObsessed]

I thought that exact same thing! It looks horrible at 4,000 miles I would not push it.

[@pjfan173]

Cole Lee Aerial Was that the first time you changed it?

[@HBFBajaRacer]

So I know this is old but just did my C7GS at 45,000 miles. Honestly looked a little better than the video. Got the car at 1100 miles so not sure if the previous owner did it early, but I doubt it.

[@pjfan173]

@@HBFBajaRacer I sold my car two summers ago and do miss it. I just wasn’t driving it at all and thought it was best to get rid of it.

[@TheCivicsiep3]

that pretty typical of used gear oil it always looks shimmery from my experience as a 13yr auto technician unless you change it very frequently. realistically the fluid appearance doesnt necessarily reflect how well its lubricating the intended parts only fluid you really dont wanna see be dark like that is brake fluid and trans fluid. black trans fluid is a very bad sign and brake fluid will definately brown a little but it should always remain clear

[@mikestevens6587]

Thank you for the great tip. I’ll be getting my C7 ASAP !!!

[@HorsePowerObsessed]

You’re very welcome! Congrats!!

[@smokey4343]

I changed mine twice trying to get that silver color out ...

[@johnglynn7795]

Justin, Morning from lovely Kolkata, India. Nothing like watching a Vette vlog on a Sunday morning! Always informative and appreciated. How many miles did you have on your Vette before changing the fluid? Blue skies and homeward bound next week. Jg

[@HorsePowerObsessed]

Hey John, Thanks for the support. I have 4k miles on my ZR1.

[@afturbo7924]

Nice video definilty im going to do it that fluid look so wear

[@HorsePowerObsessed]

Thank you! It's pretty easy and cheap insurance!

[@jazzsounds8159]

C7 for the winter weather in the keystone state and the c8 for the summer time.

[@joelpierce8891]

I made an Aluminum funnel to catch all the fluid. I like to measure how much comes out. Send it for analysis if you’re concerned

[@HorsePowerObsessed]

I'm not concerned. Just don't want that old nasty fluid in there.

[@petercarey6883]

Do the drain and fill plugs have torgue settings in addition to the marking lines? Of course watching it a second time, even if they do have torque settings, I don't know if you could even get a torque wrench in there. I guess maybe I answered my own question? Great upload Justin. Save the Wave.

[@HorsePowerObsessed]

They do have torque settings, but as you said, good luck getting a wrench in there. I think it's somewhere around 13 or 18 ft lbs so nothing crazy anyway.

[@RustyZipper]

Peter- mine were surprisingly not very snug

[@petercarey6883]

Thank you Rusty. This is the kind of information/comment that I like seeing. "Real life" experiences from real owners. Hats off to all here who do their own maintenance, upgrades and mods. I have to live by the famous advice from "Dirty Harry," in that "a man has got to know his limitations."😉

[@rondail5675]

Mine were very loose taking out, maybe only 1- 2ft/lb. I tighten snug, maybe 10-15 ft/lb.

[@gixxerboyroyluvdrumswaters9023]

Good stuff HPO, too funny with JT underneath the zr1.lol

[@HorsePowerObsessed]

Thanks! He really is hilarious!

[@georgeanddaddecker7563]

You can actually perform that service with the Corvette on the ground. You just have to fit your head under the rear bumper.Not too difficult and much easier ,believe it or not.That stuff on the drain plugs,definitely shavings. Thanks for the video.Can you do one replacing the fluid in the electronic part of the limited slip diff? It states in the manual that it takes atf.

[@perryjurgensjurgens3416]

HPO - thanks, another practical DIY videos - what was the mileage on your ZR1 - was it "Tracked" or was the condition of the Gear Oil from typical ZR1 driving - I think that makes a difference. I have a 2016 Z06 that was owned by a 76 year old Corvette hero - it's never been on the track or driven hard - it has 12,000 miles - should I still change the "diff" fluid? Thanks again for your productions!!!

[@HorsePowerObsessed]

You're quite welcome! Thank you for the support. My ZR1 has 4k miles on it and has not been tracked. This is the state of the fluid in all new Corvettes.

[@curtisfish7984]

Grea video Justin!! I was curious if you have changed the transmission fluid to prevent any torque tube issues? In my 2017 GS I had to have my original torque tube replaced 5 months and 3,400 miles into ownership. Now at 18,000 I need another torque tube!! Thank goodness it’s still under warranty.

[@HorsePowerObsessed]

You've replaced the torque tube twice in your Grand sport? I need more information! Any chance you can email me? [e-mail].

[@Team512]

Yeah this new news to me. Do the couplings and bearings go bad? I rebuilt the torque tube in my C5 when I swapped out the clutch.

[@HorsePowerObsessed]

@@Team512 I'm in for some info here, myself!

[@curtisfish7984]

The dealership is telling me the bearings are bad at 18,000 miles. That torque tube was installed at 3,400 miles. The car was making a scraping sound ( like the front air deflector on a C5) when I slowed down to 12 MPH to make a turn. Also when shifting from P to R. Now at 18,000 miles when I step on the gas it makes a metal scraping sound. Additionally, the shift point (A8) for every Mode (Weather, Economy, Touring, Sport & Track) is the same. At 35 MPH I’m in 6th gear.

[@Team512]

Curtis Fish wow! So 3400 miles out of the first set of torque tube bearings and less than 15,000 miles on the second set? Understood they replaced the entire torque tube in the process. Those bearings should have a much longer life than that. When I changed out my C5 TT bearings they had 77,000 miles on them and they weren’t making noise yet. An out of balance prop shaft can shorten the life on those bearings. Extremely hard driving can too. But this is an uncharetistically short life span for a stock car.

[@justinreid8851]

This took me 15 mins and one guy Justin lol. You definitely need to do do some figure 8s in the car to get the fluid in all the diff gears for the LSD. Then check level again after. Great video for the c7 owners!

[@HorsePowerObsessed]

Yup. It's really easy to do. It's always more fun with additional car guys, though. 🤣

[@ttcookn8246]

How’s many miles on the ZR1 at fluid change on the diff? Great content as usual!

[@HorsePowerObsessed]

Thank you! The ZR1 has 4k miles on it.

[@toddholfinger8644]

1st you said 3 quarts then 3 and a 1/2 do you just fill it until it comes out the top? Great vlog!!

[@HorsePowerObsessed]

Thank you! When I said 3.5 quarts I corrected it with text on the screen. It takes 3 exactly.

[@RustyZipper]

Mine was just a touch under 3 however I did not check it after driving as others suggested, cause : I’m lazy

[@rondail5675]

@@RustyZipper I agree! I did mine on the garage floor with a jack. Getting at the fill plug is a b-itch. I put all 3 qts in, none dripped out. It got to better because I only drained out 66oz.

[@rondail5675]

@@HorsePowerObsessed THANKS!!!

[@duramaxcountryboy2107]

Great video 👍

[@HorsePowerObsessed]

Thank you! 😁👍

[@puterg0d]

It's metal shavings mixed with the fluid. It's how diff plugs typically look at fluid change time.

[@AB-coyote]

Amsoil easy packs or valvoline easy packs. Way quicker and easier than pumping it in. Those fluids also have the LSD additives.

[@HorsePowerObsessed]

When it comes to warranty, I’ll stick with the stock fluids. After warranty is up maybe.

[@daveott7008]

Great video Justin. This is great information for all of us wanting to keep our Vettes running right. Keep up the great work, and keep those videos coming. Any thoughts on aftermarket A/S tires? Mine are coming to the end for sure by next summer. All the best from us Snow Mexicans up here in Canada.

[@HorsePowerObsessed]

Thank you! It's pretty cheap insurance and not that difficult to do so I figured why not? There was a nice set of all season tires on tire rack not too long ago. If you're not tracking the car you'll barely notice the difference in traction with all season tires and you'll be able to drive it a lot more often.

[@TexasRiverRat31254]

@@HorsePowerObsessed I'm running Michelin Pilot Sport A/S 3+ on my 2019 GS here in Colorado. They're actually a great tire. I can drive it when the roads are dry even with temps at or below freezing and still have really good grip.

[@LT4POWERED]

Just watched this again as a refresher. Think I’ll be changing mine out in the spring. I don’t notice anything currently but I wonder if I’ll feel any difference after…

[@HorsePowerObsessed]

I didn’t feel any difference. This is more preventative maintenance in my opinion. Better to change it out now than to have issues in the future because you didn’t.

[@LT4POWERED]

@@HorsePowerObsessed I’m at about 8500 miles so hopefully not too late

[@joelpierce3940]

Did this at 2000 miles after I drove home from Kerbeck. Short filled and it was shiny.

[@HorsePowerObsessed]

I just changed it for the second time and it looked the same. I've heard some of these were underfilled from factory.

[@joelpierce3940]

@@HorsePowerObsessed I drained mine and didn’t spill a drop. Yes short filled. Added back what the owners manual said.

[@FSEVENMAN]

I don't understand how you could have issues with that fluid how many miles are on that car 20,000? I'm the original owner of a 1994 Chevy Z71 4x 4 and I have never changed my rear differential fluid. Additionally high only changed the automatic transmission fluid and filter once at 150000 miles I've never had a major issue at all and I'm still running the original engine and transmission, I have 450,000 miles on the truck....

[@HorsePowerObsessed]

I don't know if it was causing issues or not, but with the way it looked, it definitely couldn't hurt to change it out.

[@ozzstars_cars]

Well you set must have set a world record then for a Chevy truck unless your 450K miles was a typo.

[@FSEVENMAN]

@@ozzstars_cars I hear what you're saying but that was no typo the 1994s that generation I think it was from 88 to 95 have a history of really high miles... And actually yesterday the miles turned to 451,000 At this point everyone's telling me not to change the transmission fluid and I tend to agree.

[@georgeanddaddecker7563]

That grey stuff reminds me of assembley lube.Molybdenum disulfide .

[@HorsePowerObsessed]

I thought the same thing.

[@perryjurgensjurgens3416]

You mention toward the end of the video that you pumped in 3.5 quarts of fluid - everywhere I've looked it is less than three

[@HorsePowerObsessed]

It's exactly 3. I corrected it with text on the screen.

[@perryjurgensjurgens3416]

@@HorsePowerObsessed - I so appreciate your videos - I'm sorry I missed it - thanks again!!!

[@raynavarra]

Justin, good stuff pal. Stupid question, isn’t the stock fluid the C7 comes with, the same fluid you just pumped in? I know with break-in you will see the metallic look in the fluid. It’s actually normal. Scary looking but normal.

[@HorsePowerObsessed]

Yes and no. The stock fluid has a break in additive that just looks horrible.

[@srome0711]

What lift does the guy have in his garage?

[@HorsePowerObsessed]

Check out his channel. Team 512. It's a Max Jax M6.

[@Team512]

Yes. It’s a MaxJax M6. Here’s the install video: kzbin.info/www/bejne/nKPJaoGpeLdoqdE

[@msdunkel]

This is a very helpful video, thank you.

[@HorsePowerObsessed]

You're very welcome!

[@Retlife49]

Can I use the same differential fluid for 17 zo6 with automatic transmission?

[@HorsePowerObsessed]

Yes you sure can.

[@Retlife49]

Ty, love your videos.

[@TheStewart111]

Hey love the channel and quality content you guys put out. Would you recommend flushing the differential case a few times with new fluid before finalizing the task? Considering how caked and slimy it was on draining the stock fluid I’d imagine not running a thorough flush would just contaminate the new fluid. Maybe it’s the OCD kicking in but the fluids should be compatible so I don’t think it’d be completely necessary.. also probably just answered my own question. Lol

[@HorsePowerObsessed]

Thank you! As you pointed out, it's probably not necessary but if you're... Obsessed... You would probably do something like that. I will be changing mine again here during the winter just because I may or may not be, well, obsessed. 🤪

[@moviehead8811]

green tab should be open

[@HorsePowerObsessed]

It's open permanently now 🤣

[@jazzsounds8159]

Couple of questions, was this the first differential fluid change? If so I'd say it's normal. The diff box has a break in period too. What is the mileage?

[@HorsePowerObsessed]

Yes it was the first one, and yes it was normal but I still don't want that stuff floating around in my differential. The car has 4k miles on it.

[@RustyZipper]

I hate the smell of Burnt gear oil and a wet mouse nest is #2

[@HorsePowerObsessed]

Agreed! It's pretty bad. 🤮

[@seniorgolfer]

How many miles did you drive before doing this? What other fluids need attention?

[@HorsePowerObsessed]

4k miles. I may do the transmission fluid next.

[@pdinnj]

Great vid bud!

[@HorsePowerObsessed]

Thank you!

[@pdinnj]

@@HorsePowerObsessed 👍

[@lynneddy2430]

Did you try using a magnet on the plug? How many miles on the Vette?

[@HorsePowerObsessed]

The drain plug and fill plug already have magnets on them. The car had around 4000 miles in this video.

[@WBOS72]

A mightyvac sction gun would be a lot faster. Great video.

[@HorsePowerObsessed]

Thank you! It definitely would be faster but I wanted to do this the cheapest way possible so other people could follow along without spending a lot of money.

[@cesarjgomez2002]

Thanks for video, very helpful

[@HorsePowerObsessed]

You are welcome!

[@DHenry-cs8up]

Hey HPO, After changing the fluid, aren't you supposed to do a couple figure 8s to make sure the fluid is well distributed in the differential? Great vlog by the way ....new subscriber.

[@HorsePowerObsessed]

Thank you! I appreciate the support. The figure 8 is really only needed if you were having issues (noise) with the diff. Just a drain/fill is all that is needed in my case.

[@nickperfetto5448]

The recommended pump does NOT fit the AC Delco 10-4034 bottle, maybe they changed the packaging! This oil now has a large mouth on it, like the Mobil 1 bottles. I had to search for a bottle to transfer the fluid in to use the pump. Just so you know.

[@HorsePowerObsessed]

I did notice that! I’ll update the listing with the one that fits.

[@MrSgtau]

How much does changing this fluid help with the gear shifting process? I own a 2019 C7 Stingray M7 with about 800 miles. Is the GM differential fluid not doing what it's supposed to do? Also, how many miles have you driven with your ZR1 before changing the differential fluid?

[@HorsePowerObsessed]

I didn't notice any issues, I just knew from previous GM performance cars that the factory fill is nasty and wanted to change it. Basically, it can't hurt and it SEEMS like it may cause issues if you leave it in there for the recommended amount of time. It won't help at all with shifting your gears, if you want to help with that you'd want to change out the transmission fluid.

[@texasrubicon392]

Wouldn’t change the shifting. That would be transmission fluid. This will help with the efficiency and longevity of the differential gears. When it’s gummy like that, it generates heat, since there’s extra resistance. You also “spend” horsepower and fuel mileage generating heat through inefficient fluid. This is a contributor to parasitic drivetrain loss (inefficiency).

[@maxfly7079]

@@HorsePowerObsessed If you were Odsessed with changing THE OEM diff. gear oil, why not be Concerned changing the trans. OEM fluid too?....All gear oil smell, Stinks...and its messy...Thx I'll get mine done next oil change.

[@HorsePowerObsessed]

@@texasrubicon392 Perfectly stated! Thank you for sharing.

[@HorsePowerObsessed]

@@maxfly7079 That is next on the list. I will be flushing this out again come spring and likely changing the transmission fluid at that point as well. The factory fill gear oil stinks WAY more than the OEM fluid refill does.

[@dcovatech]

This was a great instructional video. Thanks for posting it.

[@HorsePowerObsessed]

You're very welcome!

[@bill45colt]

my first corvette was a 1974, on my third one now 2014,,,and they are different,,,,thanks for your dedication to others you dont know to help us trod on!! Lots of great information here, carfully explained and well filmed,,,please put me on any mailing list you may have or if you can refer me to others that you recommend,,,,regards

[@pjfan173]

What’s your thoughts on Amsoil products? I plan on changing my oil twice a year. With doing that, I’m thinking Mobil 1 will do the job and keep everything safe.

[@HorsePowerObsessed]

I personally use the mobil one synthetics myself because that's what the car calls for and it's very easily obtained locally. I've heard good things about amsoil products but I've never found a reason to actually use them over mobil one.

[@MichaelGreco]

dude!!!! I had no idea about this, brought my car in for a noise and the shop checked the diff, he said it was 3/4 of a quarte low and had metal particles in the fluid! Super concerning, car has 18k miles on it. He just said let's change the fluid and check back in a few thousand miles.

[@HorsePowerObsessed]

Yup. I would not wait to the recommended interval for this one!

[@haroldneaus6225]

Must be the same crap they put in the Colorado's

[@HorsePowerObsessed]

It probably is. My Colorado is next!

[@josephhernandez5986]

So you basically need 3 of those bottles correct? I have a c7 z06 auto. This is something I really want to do. For some reason when its cold out I hear rear end noise. But once the car warms up no noises.

[@HorsePowerObsessed]

That's correct.

[@Zackakey]

Hey I'm looking to own a ZR1 by 2025 or 2026. What are some things I should replace and freshen up? I want to send it to LMR to get basically the same car SS717 has but with an exhaust. If you give me your insight that would be great!

[@HorsePowerObsessed]

Sure! I'd definitely start with an oil change and a diff fluid change. If it's a manual a transmission fluid change and a clutch fluid change can't hurt either. The car ages pretty well so aside from the fluids, you're pretty much good to go.

[@Zackakey]

Thank you!

[@HorsePowerObsessed]

You're welcome!

[@edwardpickering7287]

Just bought my first corvette, 15’ z06 with some minor mods. Car is insanely fast, can’t imagine how fast that zr1 must be like. Can the differential be flushed using a jack? Do not have access to a lift.

[@HorsePowerObsessed]

I had a 15 Z06 before getting the ZR1 and you're right, it's insane the difference between the 2. The ZR1 is a freaking beast. It's best to have the car level when draining the differential but if you can achieve that with a jack and jack stands then you should be fine.

[@billthompson9595]

what mileage are you changing the dif? what mileage?

[@HorsePowerObsessed]

My car has 4k miles on it.

[@billthompson9595]

Thank you Sir you are scholar and a gentleman.

[@HorsePowerObsessed]

@@billthompson9595 Thank you, good sir!

[@Zozzed]

@@HorsePowerObsessed You are such a gentleman answering this question every time like it's the first time any have asked :) I think this is also a standard "first visit" line from a dealer visit - "We looked at your differential fluid - it is slimy and stinks and we recommend replacing it" $228.

[@848evo4]

that's how it will always look when you drain the fluid from a new cars diff or manual trans that use gear oil after a few thousand miles of driving. running the gears in by use is the final machining process. The fluid GM put in looked like the fluid you put in. What you will find is the fluid will look clean for a long time after you change it the first time. All the stuff on the magnets if fine metal, think metal dust.

[@HorsePowerObsessed]

That's what I figured. I definitely like the idea of getting the initial fill fluid out for some fresh fluid, though.

[@848evo4]

@@HorsePowerObsessed I would go a year or 10-12,000 miles then do the change. After that you'll be surprised by how clean the fluid is, unless your racing/tracking then it should be changed at shorter intervals. Change that brake fluid at least every 2 years

[@HorsePowerObsessed]

Agreed.

[@ClaytonYatescarenthusiast]

Can't believe I don't like the c7zr1. I mean it's the one I'd obviously take but don't love it looks wise

[@HorsePowerObsessed]

That's interesting. Definitely personal preference then because I haven't talked to many that don't like this beastly vehicle. 🤷‍♂️

[@dateatorjr9671]

That be metallic silicone 😂. That’s normal on any magnet plug you pull out of any diff. You can also put some new fluid in with the drain plug out to flush more crap out. The real issue with C7’s was the low fluid level from the factory.

[@HorsePowerObsessed]

Mine didn't seem low, I'm pretty sure that was fixed in the later years of the C7. It was not metallic silicone, it was literally metal particles caught on the magnets during break in. 👍👍

[@pjfan173]

When do you plan on changing it again? I’m very interested to see what the fluid will look like

[@HorsePowerObsessed]

I will be changing it again shortly after taking it out for the spring. Probably April or May.

[@pjfan173]

HorsePower Obsessed it’ll be very interesting to see the condition of it. I’ve said the in before. I bought my first corvette last summer and have never even done an oil change on any of my vehicles over the years, but with channels like yours and other ones I’ve decided to do as much of the service n it as I can. I don’t have room for an actual lift, so I bought a Quickjack

[@HorsePowerObsessed]

Absolutely. I'm interested to see how much more was left in the cooler and everything as well. The stock fill was pretty messy and I want to make sure this car runs as smoothly as possible for as long as possible. Nothing quite like doing your own work on your car.

[@rondail5675]

Thanks! In the beginning you said 3 qts. After pumping and then it started leaking out, you said you got 3.5 qts in. Did you mean 2.5 qts? I just did mine, plugs were NOT tight at all. I drained out just over 2 qts. I pumped in 3 qts, lower the car, and none dripped out. So I am wondering if I do need 3.5qts!

[@kiyalami8478]

Don't you have to bleed the diff oil cooler when you do a diff oil change?

[@ppeller3]

How many miles on your car? Great how to video! Thank you for posting this one...👍👍

[@HorsePowerObsessed]

Thank you! Only 4k miles...

[@Tbob17]

Dang, that’s not much mileage...I have 8k on mine...will have it changed next spring..thx! And I will have my c8 by then too!

[@HorsePowerObsessed]

It's not much mileage at all but I've changed this in 2 other GM performance cars and had the fluid that looked exactly the same so I knew it was going to be this way on the ZR1 as well.

[@ppeller3]

I know what I'm doing this spring!!!! I have 19k on my 2017 GS! Holly cow! Times a waste in...

[@HorsePowerObsessed]

It's easy enough and fairly cheap insurance.

[@raydelfa1125]

thank you.

[@HorsePowerObsessed]

You're quite welcome!

[@raydelfa1125]

I just turned 15k miles on my 2019 Z06 think I'll change that fluid now.

[@HorsePowerObsessed]

I definitely would!

[@jeffhackett6178]

My 2014 c7 z51 feels like it has a spool when turning tight in parking lots, is that normal? Only 7k miles on vehicle

[@dominickandrade1288]

do you have to this on automatics. if so how frequently. thanks.

[@HorsePowerObsessed]

Same applies to the automatics. I would say every couple years depending on how often and how aggressive you drive.

[@tavom8755]

Do all c7 take same amount of diff oil?

[@scottbarker9058]

nice vid..im goen 2 change mine in me 18 grandsport soon..ive been using amsoil signiture series 4 the engine...but i wood like 2 use amsoil a the diffr...but i cannot find anywhere if its okay 2 use in an electronic limited slip??WHAT DOO U THINK???

[@HorsePowerObsessed]

I’ve heard it’s ok to use.

[@scottbarker9058]

@@HorsePowerObsessed thancs.ive since then contactrd amsoilo...yep..they do not make an oil 4 the c7 electr. limmited slip diff.

[@MacDaddyC7Z06]

I know this is a old video. My C7 Z06 (2016) has a terrible whining noise. I'm assuming it's the diff because they had issues with the fluid level in the 15s and 16s. Would this fix the whining?

[@HorsePowerObsessed]

It's definitely a good place to start!

[@ntecl4d]

Did you fix the whining?😊

[@MacDaddyC7Z06]

@wolFL4D2 nah. I had the diff fluid replaced. They said it looked nasty and the winning went down a good 50 to 70% but then after a few days it went right back to normal. Probably going to have to get a new diff unfortunately.

[@ntecl4d]

@@MacDaddyC7Z06 new diff wont be necessary in your case, why don't you just buy some new ring and pinions? they should get rid of the whining/howling.

[@MacDaddyC7Z06]

@@ntecl4d apparently it's cheaper in labor to just do the whole thing. But I'm definitely going to look into it

[@jacksherman5696]

Will this help with the C7 A8 Shudder. Having my transmission flushed and now my diff changed next week. Thanks for the advice.

[@HorsePowerObsessed]

No it won't. That is a separate issue, but having GM flush the fluid out of the trans a few times will help from what I've heard.

[@FreeSmokeEA]

Amsoil transmission fluid need to flush it 3 times

[@MAC_CUACHIN]

Why grandsport is more wider than z06? Its even more bigger than zr1🤔

[@HorsePowerObsessed]

Definitely isn’t. The ZR1 is the widest and the grand sport and Z06 are the same width.

[@scottbarker9058]

NICE VID..I HAVE 10-K ON MY 18 GR. SPORT...HOW MANY MILES IS RECOMMENDED/ + what about the residual oil in the cooler system?

[@HorsePowerObsessed]

Thank you. GM doesn't say that this is required until around 40,000 mi. In my experience I think you should do it a lot earlier than that just because of how it looked after 4,000 mi. There is a little bit of residual oil in the actual radiator and the only real way to get it out would be to flush it again. I do plan on doing that this upcoming spring along with the manual transmission fluid.

[@scottbarker9058]

@@HorsePowerObsessed thancs 4 your timely responce.

[@HorsePowerObsessed]

You're quite welcome! Thank you!

[@jameswalton8927]

Hey HPO, maybe I missed it but what was the miles when you changed the diff oil?

[@HorsePowerObsessed]

Hey. It was about 4400 miles.

[@FrontSeatDriver]

Nice "drone" footage. 😜

[@HorsePowerObsessed]

Thanks. It was a free "drone" that I got just for heading out to the Team 512 garage!

[@Team512]

Glad I survived the “drone” footage. Shoulda cleaned the gutters while I was up there. 😂

[@HorsePowerObsessed]

Yeah you should have. Mine need cleaned.. 😒

[@dereklikos8267]

Just bought a c7 z06 had 23k miles on it, did the change and holy shit was it nasty, car also shifts better now

[@HorsePowerObsessed]

It's crazy how nasty it is even at low milage. I plan on doing mine again soon just for good measure.

[@leedimatteo5078]

open that oil tank vent HPO lolol

[@HorsePowerObsessed]

🤣🤣🤣

[@leedimatteo5078]

@@HorsePowerObsessed I noticed the vent was ripped off later in the video lol

[@HorsePowerObsessed]

lol yup. It broke!