REAL REVIEW: Rear Main Seal Stop Leak

Buy BlueDevil Rear Main Sealer @ amzn.to/3vaQFI6
So in this video I try out Blue Devil rear main sealer. I have a 1993 Ford Mustang 5.0L V8 with a common rear main engine oil seal leak. Removing the transmission and replacing the rear seal it is very expensive to have the work done by a mechanic.
I've tried different stop leak products in the past such as ATP's AT-205 Re-seal but I am open to try other products like this one from Blue Devil.
Watch to see if it helped or not. As an Amazon Associate I earn from qualifying purchases.
#BlueDevil #FoxBodyMustang #Ford #Mustang

[@InternetDude]

Here is the link to buy Blue Devil Rear Main Sealer : amzn.to/3vaQFI6

[@jamestallman1825]

We lost about 1.5 qt of oil thru rear main seal leak on our 2010 Toyota Camry; added Blue Devil Rear Main Sealer and it stopped the leak. That was 4 years ago and the seal is still holding; NO LEAK. Excellent product - - tried and tested.

[@InternetDude]

Great! My car still has a very tiny drip once in a while, didn't work completely for me but did slow it down.

[@DWHGWIHW]

This is amazing, I'm getting it today. I literally just spent three days changing oil pump gasket, front crank seal, cam seals, oil filter adapter gasket and oil pan gasket on my 2002 Xterra 4x4. Pain in the but because I had to drop everything to get to everything lol. Got it all together and have a very slow rear main that I didn't catch. I don't feel like pulling the transfer case and trans to do it so I'm stoked to know this helps people with heavy leaks!

[@froylanmiranda7362]

Should've used a funnel. Nice car better than the new cars

[@mickeytate1]

Great Did you add it when the engine oil was hot.

[@NoWr2Run]

@@mickeytate1 I added it with engine running & fully up to Temp. It worked right away, I AM STILL AMAZED. I ALSO CLEANED UNDERNEATH " VERY WELL " BEFORE PUTTING THE SEALER IN.

[@frankbama3684]

I couldn't find a more recent Blue Devil rear main seal repair video so I'll comment here. I have an 06 Silverado 4.3 with >170,000 miles on it. Several months ago the rear main began leaking. I finally made an appointment with a former GM tech to replace the seal for an estimated $800. That was supposed to happen to day, 11/29/2022. I am usually skeptical of miracle auto chemicals but what the heck. I've seen video after video on several products. But on Sunday afternoon I decided to take Advance up on their email giving me 25% off. I ordered this stuff and went to Advance to retrieve it. I poured it in right there in the parking lot. Round trip was about 15 miles. I decided to park on the clean side of my driveway much to the dismay of my wife. OK, I don't get it. It's supposed to take longer than that to work, right. Folks, Monday morning there was maybe a quarter size drop on the concrete and it was leaking way worse than that before. I drove quite a few miles yesterday. This morning the new spot is dime size. Can this stuff really be this good? I am beyond satisfied and just hoping that it lasts..

[@InternetDude]

It rejuvites the seal so it can work depending on how bad the seal is. So you just might get lucky, it absolutely slowed down my leak, although it did have a little drip after a few days of sitting.

[@j.w.7461]

It stopped rear main seal leak on my 2000 Astro van. No leaks 5 month's later. Very impressed. Be patient.

[@InternetDude]

Nice! I honestly haven't driven this car much lately but I will continue to keep an eye on it.

[@rotsbelramos7685]

What if my 2004 Silverado leaks 2 quarts a day

[@teddy_awdB19]

@@InternetDude. Update? Work or not for you?

[@Aqatsuki]

If it fixes it or even slows it down majorly like your saying it did that’s perfect I’m completely good with adding a quart between oil changes just don’t wanna have to check my oil Everytime I go to work

[@justinlalko7834]

Fr bro I have a lake under my truck everyday

[@ybsensei5072]

@@justinlalko7834 lol real

[@justinlalko7834]

@@ybsensei5072 it fixed it had a lake under my truck dropped this in now it’s all dry and just a drop

[@ybsensei5072]

@justinlalko7834 great to hear bro!! I will be purchasing it soon. Fingers crossed

[@somanynamesilltrythis0180]

Wow, I didn't know blue devil made one for the rear main seal. I'm sitting here trying to figure out the best way to change the seal, but now I think I'm gonna go out and get a bottle of this stuff, and see how it does in my car. Thank you so much for making this video.

[@InternetDude]

Good luck! I have found that after like 3-4 days I may get a drip still. But it's so minor I don't think it's worth paying a mechanic to repair. If you plan on keeping the car forever and driving it daily then it may be worth replacing the seal to you.

[@somanynamesilltrythis0180]

@@InternetDude true, I might get the transmission repaired sometime down the road, but I just bought this 04 mustang and the rear main seal is the biggest issue with it. I'm just glad I came across your video. Hopefully, this will give me some time. I bought a bottle today.

[@InternetDude]

@@somanynamesilltrythis0180 it is a very common issue on these engines

[@mercedesbenzs600bash]

@@somanynamesilltrythis0180 Did it work???

[@somanynamesilltrythis0180]

@@mercedesbenzs600bash no it didn't, unfortunately. From what I can tell, it didn't help at all. Someone on KZbin sent me a video on this stuff called AT-205. You can buy it on Amazon, I just put a bottle in the car. It's similar to the blue devil, but this stuff is apparently better. The only thing is, you need to add a bottle of the AT-205 every time you change the oil. I think it's around $17 per bottle, but definitely worth a shot.

[@werlost9858]

I put it in my 02 Avalanche 5.3 with 256k and it helped tremendously for about 5k miles, now its gushing. Going to try another bottle and see what happens. It seems a great option in a pinch, but its definitely not a correct permanent fix.

[@InternetDude]

Yeah it isn't as good as replacing the leaking seal but it can buy you some time.

[@bradhenke7552]

So how did the second bottle work

[@Dick_Swinger]

If it's coming from the back of the engine up high it could possibly be the oil pressure sender. 5.3 is bad for that. You need a specialty socket and some extensions with a swivel iirc to change it but it's not that hard. I had a LM7 Tahoe that leaked out the sender and I put up with it for years because it looked hard to change as you can't see it. Then I had a Sierra and it was reading no oil pressure so I had to change that one. After changing it I felt like an idiot not changing the other one because it was easy. You just have to work by feel cause it's buried

[@boost331]

How it works.... The stuff uses the same stuff they add to "high mileage" engine oil. It causes rubber rings and seals to swell. Sometimes thats all it needs to stop a leak on an old worn seal.

[@InternetDude]

Yes, true.

[@NoWr2Run]

@@InternetDude I tried High Mileage Oil for 3 Oil Changes, about 10,000 miles, NOTHING. This sealer worked RIGHT AWAY on my 97 4.0 Jeep. It never leaked 1 drop after cleaning up underneath FIRST, then adding 8 0z's of this sealer. Only drove about 30 miles, COULD NOT BELIEVE HOW FAST IT WORKED, that was 2 months ago & NO LEAKS SO FAR. My Jeep is not a a DAILY DRIVER EITHER. I was losing a quart & 1/2 every 3,000 miles before this sealer with High Mileage Fully Synthetic Oil. So far NO LEAKS AT ALL, SO IT'S WORKING FOR NOW.

[@jordanalexander615]

My truck drips maybe five drops a week after it sits. So I might try this since it's just starting. I rather not pay someone a thousand dollars when the engine probably doesn't have 50k life left. It's at 265 now and has been very reliable as far a the engine goes. Electronics is another story.

[@InternetDude]

5 drips per week is very minor, I think this would work for your case.

[@jordanalexander615]

@@InternetDude it's only when it sits too in the winter. I figured the temperature difference may cause it to become harder. I smell it from the engine burning it off and then it goes away for awhile until I let it sit again.

[@Aqatsuki]

The mileage in your motor don’t matter if that thing still Purrin don’t talk about it dyin lol

[@jordanalexander615]

@@Aqatsuki it matters when you can't replace it. I need to get a new motor before this one gives up, not after.

[@lesterclaypool2194]

Did it fix your exhaust leak since you spilled it all over the header?

[@InternetDude]

It did!! 😂😂👍

[@davothegreat9990]

🤣🤣🤣

[@gabrielpichardo1492]

Hahahaaaa got me dyin here

[@eddieg85]

😂😂😂

[@lucyfur8068]

Mean but very funny 😁

[@PartyWolf36790]

My rav4 was losing 1 quart of oil every 3 work days. That's 20 miles to work and back everyday and lost 1 quart of oil. I hope this works I saw huge puddles of oil every now and then.

[@InternetDude]

Not much to lose by trying it!

[@PartyWolf36790]

@InternetDude it worked running strong now and Lil to no oil loss 💪 love the product.

[@BLAM777]

​@PartyWolf36790 is it still working? Was just told my 2016 has a RMS leak and I'd rather not pay over 1500 to fix if I don't have to.

[@PartyWolf36790]

@BLAM777 it does work as a temporary seal yes. My car dosent leak any/ or as much as it used to. I drove about 300 miles every two weeks for work and barley need to ad oil now. So yep it indeed works temporary until u can fix the problem

[@BLAM777]

@@PartyWolf36790 thanks. I just hate that it will cost me over $1500 to install a $33 dollar part.

[@retrobear9367]

I'm gonna try Bars tonight on my 03 Corvette. Hopefully that's basically the same thing. Been replacing all the cheap parts chasing down an oil leak. But I think it's the rear main ugh

[@InternetDude]

Good luck!

[@retrobear9367]

@ thanks. Ended up going with Blue devil so 🤞

[@jesusvazquez9625]

Man are you serious? I was about to pay $500 on my Honda Civic 99 to fix that and then pay extra $420 for the rack and pinion fix it too. I’m gonna try this and if it works I’m gonna just fix the rack and pinion!! Thanks bro! Finger cross 🤞

[@InternetDude]

You have very little to lose by trying it! Give it time, too.

[@Russell-rc6qq]

Quit being cheap. These are leaks I have resolved in my 2001 car over the last year: valve covers, water pump, oil pan gasket, oil pressure sending unit, timing cover gaskets, power steering rack (rack and pinion), struts, rear drum brake cylinders (eight total leaks). Talk to mechanics and most will tell you they don't recommend sealing agents (and it's not just because they want to do repairs!).

[@NoWr2Run]

@@Russell-rc6qq I get what your saying but to repair a REAR MAIN OIL LEAK on most cars is pretty BIG MONEY unless you do it yourself. I took a chance & spent $23.95 & my rear main oil leak has stopped for now. I do have a REAR MAIL SEAL waiting on stand by in case it starts leaking again, I ALSO " DO NOT LIKE ADDING THIS TO MY ENGINE ". Hopefully Blue Devil WILL NOT PLUG UP ANYTHING IT'S NOT SUPPOSE TO ? My oil Pressure is the same & NO LEAKS, SO I'M DAMN HAPPY. I did change, Valve pan gasket, Oil Filter O-Ring, Timing Chain Cover, Automatic Trans. lines that leaked, Water Pump, Heater Core but the REAR MAIN was going to be a PAIN IN MY ASS, so I added this stuff & it's working GREAT. So I'm not lazy, just took a chance on Blue Devil instead of HOURS & HOURS OF FIXING REAR MAIN SEAL LEAK " THE RIGHT WAY ". Maybe in the future I'll have to, WE WILL SEE, HOPEFULLY NOT, LOL. AS IT'S A 4 WHEEL DRIVE, MAKES IT HARDER TO FIX.

[@BLAM777]

Might try it. I was just told i have a rear main seal leak after my oil change a couple of days ago. Was told it's just over $1500 for the repair on my 2016 rav4. Checked the oil, and it's still full and nothing on the cardboard i put under the car. Seems odd that there's no oil anywhere on the cardboard if it's dripping like i was told.

[@InternetDude]

It may be a minor seep at this point, so it may not be bad enough to drip yet.

[@Elite328]

Let me know how it goes. I have a scion tc 2015 essentially a camry...not sure if i wanna use this sealer stuff or get it replaced... got quoted for $1700

[@Cparker8]

Usually cars have a cover underneath the engine so the oil leaks drip on that first.

[@BLAM777]

@Cparker8 yeah oil hasn't gone down at all. I'm thinking there's no leak because the oil would go down on the dipstick, and it hasn't.

[@wayneskinner5931]

Didnt stop my 2015 f150 5.0 rear main seal from leaking at all.

[@InternetDude]

Must be a failed seal then, not just hardened.

[@gregpadberg1402]

Check back again a ways into your next oil change? I'm curious if the leak starts up again after the existing oil has been replaced.

[@InternetDude]

Hi Greg, they say it's permanent, we'll see... I will have to look but I don't think I'm due for an oil change for another 1,000km or so. I don't drive it much so that probably won't be until fall when I put the car away for winter.

[@davothegreat9990]

I'm sure you need to add it will every oil change.

[@yoylencastillo1461]

I added it and came back

[@RedneckGarage]

I always wondered about the devil additives - thanks !

[@InternetDude]

Thanks, Dave. I've used BlueDevil in my trans too years ago, can't remember it helped, it was too long ago LOL

[@davothegreat9990]

@@InternetDude how could you not know? Using things like this on my car, I would never forget. Strange...

[@InternetDude]

@@davothegreat9990 I’m talking it was like 5 years ago probably….

[@tommys5749]

@@davothegreat9990 The guy spilled the liquid all over his engine, and you're asking him a question like that..lol.

[@PPA87]

Can you Do a review when u change the oil ?

[@InternetDude]

Thanks for the suggestion!

[@emilyhobbs663]

did you do the review

[@paticus7185]

Thanks for the video.. I'm for sure going to look into the product. Very clean pony car by the way. Always loved the Fox body.

[@InternetDude]

Thanks for watching!

[@garyesada5766]

Did you have high mileage oil in your car?

[@InternetDude]

Nope, Walmart brand full synthetic 5W30. In hindsight I perhaps should have used regular 10W30 due to the leak.

[@blackenigma1054]

i was thinking about trying it, thanks for the review!👍🏿😂

[@InternetDude]

Hope you like it!

[@spec20]

I also have that same nuisance oil leak on my "04 GT. Going to give it a try. Thanks!

[@InternetDude]

Good luck

[@ErickF1293]

Trying this product in my old 99 Honda Civic Ex hopefully it works

[@williamhaskellhaskell3162]

They day blue devil is too extreme for such a small leak. Try bars leak 1040.

[@InternetDude]

I may try that in the future.

[@leroygarza4316]

I have 2008 Chevy Z71 with a rear main seal leak and used that seal repair and didn't work for me bit willing to try it again maybe it will work this time or maybe my leak just needs to be replaced

[@InternetDude]

How long has it been since you tried it? The real true fix is to replace the seal but you can get lucky using this product sometimes. You could try another bottle or your leak could just be so severe that this doesn’t work since the actual seal could be damaged.

[@SWIXGIN]

I put some of this in my car at about 9 AM this morning and it’s still leaking

[@InternetDude]

It takes time

[@deshontruesdale5562]

Do it work on a 2006 Cadillac Dts

[@InternetDude]

Yes

[@axelalfalla8305]

Excellent 🇵🇷 Mustang GT 4.6L 97

[@InternetDude]

👍

[@solracanidem2948]

Hi great video ! Do you know if it works with LS engines ?

[@InternetDude]

It should work with any gas engine.

[@rictri03]

Do you have add a bottle with every oil change or not?

[@InternetDude]

As far as I know you don't need to. I would be tempted to add one with oil changes, maybe not every time but every other time maybe try it.

[@elainepacan871]

Yes every oil change it says on the bottle

[@CrzzySouls]

I’m thinking about trying it till I get more money to actually change the seal which will be less than a month will this help perfect for my 6.1 hemi?

[@InternetDude]

The real fix is to replace the seal. This doesn't hurt in the meantime until you can get around to the actual fix.

[@CrzzySouls]

@@InternetDude it kind of slowed it down but ima take my car in within 2 days from now so it definitely worked I just drive at 45mph

[@ceceliabeck8967]

So do you use rhe whole bottle

[@InternetDude]

yes

[@NoWr2Run]

@@InternetDude The Directions are kind of STUPID IMHO. Number 1 on the bottle says "POUR WHOLE 8OZ. BOTTLE IN ENGINE. " No. 2 says " START ENGINE, DRIVE VEHICLE TILL LEAKS ARE SEALED ". Then NO. 3 say's, LOL, 1 8 OZ. BOTTLE TREATS UP TO 8 QUARTS OF OIL " ? I WOULD THINK No. 3 WOULD BE No. 1 ? My engine takes 6 quarts of oil but I poured the whole thing in, 8 OZ'S. So by their " DIRECTIONS " I only needed 6 Oz's ? I would have put the whole 8 Oz's in regardless because my leak was so bad. So it's up to you based on your engine ( HOW MANY QUARTS OF OIL IT TAKES ) or how bad your leak is, YOUR CALL.

[@carolgreen-fn1tm]

Thank you

[@t.j.h2810]

I tried it a year & 1/2 ago, no fix my Z-71 seal and they never sent my refund as stated, yes I did exactly what they suggested on both transactions. F'em.

[@InternetDude]

That sucks

[@chrisgalea4334]

I used blue devil on my 300c didn't work at all

[@InternetDude]

OK worth a try

[@Skedawg88]

It works for me.

[@CombatJJ]

What issue were you having and how is it now?

[@johncaron7673]

try using a funnel instead of waisting half of the product

[@InternetDude]

Ha ha yes next time

[@andres99house]

What's it to you, its his car.

[@johncaron7673]

@@andres99house you know what you can do

[@kccodex8931]

@@johncaron7673 Something with the sealer?

[@benallman3978]

why not just change the seal?

[@InternetDude]

It’s a bit beyond my ability so it would cost in around $1,000 at the mechanic.

[@benallman3978]

​@@InternetDude I understand. How does that stuff work? Does it coat the rubber seals in the engine? I wonder if it also coats metal pieces.

[@InternetDude]

@@benallman3978 my understanding is it’s a polymer that swells / rejuvenates the seal making it a bit larger. Seals harden and shrink over time.

[@Russell-rc6qq]

@@InternetDude My experience has been mechanics will often do extra things without charging additional labor while they are in there when you have a large job done. Example: I had the valve covers and intake gaskets redone in my car last August. This was 10 hours labor. While the mechanic had everything apart he redid the EGR valve gasket, PCV valve, and thermostat just for the cost of the parts. So a $250 standalone job to do the thermostat just cost me $10 for the part. Consider this kind of thing when you weigh the pros and cons of having work done. Basically, don't just scoff at the heavy price tag necessarily thinking it's just for one thing and it's too much or not worth it.

[@ceceliabeck8967]

I'm not changing mine. I have 250,000 miles in my truck. Just not worth it. Costly

[@Aokay1016]

Awesome 👌🏼

[@InternetDude]

Thanks ✌️

[@johnsonckchu]

great suggestion

[@InternetDude]

Glad you liked it

[@jb1221]

It sure dose work 100 percent

[@InternetDude]

Great

[@rotsbelramos7685]

🙂

[@InternetDude]

Thanks.

[@rodneycaupp5962]

My leak for a day is about 6 or more inches. Come on now... roll the Video. Ok, my opinion is you are likely to become filthy rich someday, making this kind of video. I will give the sealer a try, but again, my leak is much worse. It sat for 5 years and never left a spot, ... with all the oil in the pan. Two days of driving , I have 6 or more 4 to 6" spots. I'll try to stay in touch. How bad is a seal job... cost and labor without a lift in my garage

[@InternetDude]

Replacing the seal if possible, is the best choice. The seals themselves aren't usually that expensive, it's the labor to change it that adds up. Good luck.

[@claudiovallejos-ib5wq]

muchachos ,como siempre digo "los milagros no existen" me canse de gastar dinero en esa mierda todo mentira

[@InternetDude]

OK?

[@rotsbelramos7685]

Why would you post that it didn't work and then you said it dose that's too funny

[@InternetDude]

It mostly worked LOL

[@FGTony]

gloves to add a can of fluid.......... jesus christ

[@InternetDude]

Eh I just tend to use gloves so I don't get dirty and so I don't scratch my hands. You do you though.