Keep Your Subaru Running Like New! Subaru Engine Maintenance Kit

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0:00 Intro
1:30 Kit Overview
3:04 Throttle Body Cleaning
11:06 Upper Engine Carbon Clean
19:14 Fuel Treatment
19:50 Precautions/Advice
21:18 Outro
Subaru Engine Maintenance Kit - amzn.to/3wlHoPL
Subaru Engine Maintenance Kit - tinyurl.com/2s4eaey4
Subaru Upper Engine Cleaner Tool - tinyurl.com/4wz8jbr3
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----I assume no liability for property damage or injury incurred as a result of any of the information contained in this video. I recommend safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond my control, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not myself.----

[@The9meister]

I do a Italian tune up on my vehicles, basically I add fresh fuel with fuel injector cleaner, and go for a long drive at 70mph, burns the carbon up, then as soon as you get home, drop the oil and filter, then replace fresh oils / filters , will run so much better 👍

[@DJJ81]

If you’re only going 70, that’s not an Italian tune up, unless you’re in 2nd gear

[@mresab1997]

@@DJJ81yeeeee 😏🔥

[@extraglutenplz3758]

for direct injected engines this will do nothing....

[@steves7072]

70mph 😏😉

[@emp5352]

People talk about Italian tune-ups confidently, as if Italian cars last a long time or something.

[@dylans3553]

i love how careful you are with removing everything

[@scottmcd5885]

Another great video thank you! I wanted to add one thing. While air plenum is off look around. On my 2009 Forester I noticed that the rubber bell housing cover had become hard an was literally ready to fall in the bell housing. (I bumped mine and had to spend an hour fishing it out). Service was as straight forward as shown. And surprisingly enough. My local stealership had both parts in stock and even price matched the prices found online.

[@Abucody]

Thanks Mr. for the best information on Subaru’s outside the dealers.

[@alanshaw6161]

Your knowledge on these subjects is invaluable! Thank You for taking the time to share this information.

[@timbrown9731]

The clear flood mode works great, if your Subaru has been sitting for a while and you can Crank to build oil pressure before had.... and on oil change too

[@aechdea]

Great video in all aspects. The only small correction is the link for the Upper Engine Cleaner Tool goes to the one for a metal can (SOA868V9431), not plastic bottle (SOA868V9430). Interestingly, the metal can product is named Top Engine Cleaner, while the plastic bottle is called Carbon Clean/Engine Maintenance Kit.

[@gbhrps]

YOU ARE THE MAN! This is just what I've been looking for to fix my Bride's 2019 Forester (my own 2017 OutBack Premier doesn't have DI)! THANK YOU!!!!!!!!!!!!!

[@ricepony33]

Get the tool! Just did this on my 05, the valve really helps meter it when you’re working solo.

[@solargoomba]

Dealership wanted $300 for this treatment. Thanks for saving me some money

[@lp2565]

Great video. Thanks for sharing. Will be purchasing the kit in the future.

[@user-ce3rh8jh4i]

You are the man, great explanation, great camera work, thanks again for sharing.

[@jacobserugo9434]

I have tried on my impreza N14 with only the injector cleaner, but now , I feel a big difference . Thanks Mr Subaru

[@seant6624]

My moms 14 forester was having random misfire code. I did the the Subaru TI recommended fix with the top end cleaner, had to make the tool myself because no one had it in stock. Ran 2 bottles and changed oil, it didn’t fix it. Had to walnut blast the valves because they were that bad. That finally fixed it.

[@georgeferlazzo7936]

Hello again Mr. Subaru 1387 Thank you for another Great Video. I enjoyed watching you progress through this subject. Again thank you

[@jimluense1494]

Thanks for the great video. My Outback is do for this service job on my need oil change. I will let my Subaru dealer do this because my Subaru dealer will keep track of all the service work I had done.

[@TimJoseph08031990]

I did take my mom's 2014 Forester for this kind of engine service to the Subaru dealer. The only things I do myself is change the oil and oil filter, CVT Fluid, and Front and Rear Differential Fluid. The Front Differential Fluid needs a 1/2 in. I.D. and a 5/8in. O.D. tubing with clamp for the quart pump to put fluid in the overflow plug, because my fill plug for the front differential was unable to turn counterclockwise with the 8mm Allen socket before removing the overflow and drain plugs. I also use Gumout fuel system cleaner once a year, since it also has the PEA additives.

[@20VA]

used the CRC 5 in 1 GDI performance rejuvenation kit on my 2018 Elantra Sport turbo every 5,000 miles for 2 years and neen using it on my 2020 wrx Limited every 5,000 since I traded my Elantra Sport for it back in june of 2020 and both vehicles have ran like a charm ... no issues whatsoever ... I actually pour the fuel treatment in on an EMPTY tank so it mixes well as I fill up and I pour the oil friction gaurd in after pouring HALF the engine oil in so that mixes very good as well and I spray the valve cleaner through the intake duct so it cycles through the entire intake system ... I also have a Crawford's Performance v3 air/oil separator that I literally installed the day I purchased the vehicle brand new and brought it home ... let me tell you that thing works like a charm because my oil level is at the exact same mark from when I filled it up when I change the oil ...

[@mergerysichembe3961]

Very helpful am expecting my Subaru this month end can't wait

[@stephengalgay784]

Great video. Learning how to take care of my 2011 Outback and your instructional videos have been easy to follow and extremely helpful.

[@4skully]

i love both my 2011 subs my girls!!!

[@asmodeusasmodeus7591]

Great video, thank you. Something that would be nice from a viewer's perspective, would be a borescope view of the intake valves before and after. You are the Number #1 Subaru guy on the internet!

[@jamesm.8392]

Not criticizing MrSubaru"s procedure just adding another with Scotty's . . . Humor kzbin.info/www/bejne/eZnFk4Vje6qLY5o

[@Papa_Send]

We have a complete service kit (oil, oil filter, sump plug washer, upper engine cleaner, fuel treatment, window washer fluid) in Perth :) makes it easy to buy it all

[@21jimmyo]

Good to know Subaru has a process to address the one major downside of direct injection. This is remarkably similar to using the old-school Seaform cleaner.

[@moparsrt1905]

They always had a process to deal with it. It's called port injection lol

[@21jimmyo]

@@moparsrt1905 the best is to have both, like my Toyota has.

[@roofcamper3473]

Yes, I have an IS250 and an IS-F. The IS-F is a masterpiece, the 250 not so much but its still a good car. Just need a walnut blast every 200k miles. I do redline the 250 once a drive when its at operating temp.@@21jimmyo

[@MadDogClyde741]

Hey Mr. Subaru 1387 ! I just have to tell you this because even though you already get a lot of thanks and appreciation from people as I can see in the comment section ! Thank You So Much Man ! You my man are “The Wizard” to me and I’m sure to a lot of other people ! Your videos are an excellent library of unending information and knowledge for many, many people ! I can tell by watching many of you’re videos already that you are a man of very high character and morals ! Your Family is very fortunate to have a Husband, Father, Brother like you and I’m sure you do an awful lot more to help people in your life than make videos to help many others to save money and make their lives easier ! Im just so appreciative of your videos because the help me an awful lot ! And I’m a pretty mechanically inclined person and it makes it so much easier to do myself then figuring it out on my own ! Thank You Again and I’ll always be a subscriber ! I’m gonna leave you a few bucks just to say thanks and hard work and to show you how much I appreciate you ! Have a great day and God Bless Man ! P.S. Just so you know I have never left a penny to anyone ever on you tube ! I have never felt anything I’ve seen that warranted leaving A Monetary Thanks Tip ! If some people just gave a Buck atleast I’m sure it could help out ! I don’t have much money but I’m going to leave you $10 bucks and maybe that will make some more people to think about it and just leave a $1 dollar ! Just like they should leave the guy who helps them when they pump the gas into their Subaru’s !

[@siecieh]

Same issue on '12 forester FB25 with 40k miles, 10 min fix by cleaning the throttle, smooth ride and a great night sleep... actually I didn't take off any hoses, just the air duct and the throttle body.

[@stevemcrichards8768]

So important to think tiny little sips and not big gulps when using that top end engine cleaner with the special tool. I think you did a good job of showing how you need the special tool to regulate the flow of the top end cleaner into a three part process.

[@petset77]

Sips versus gulps are what general intake cleaners recommend by spraying short bursts with the aerosol types, and having another person on the throttle so the engine doesn't stall. I'm here on this video to ask if those are safe with this engine.

[@stealthg35infiniti94]

I do a similar operation but instead use CRC Throttle body cleaner to the butterfly and barrel using a toothbrush without removing the the throttle body. Then use Seafoam Spray into a vacuum line near the manifold. Running about 2.5 K RPM, spray the entire can. It will take about 10 minutes to empty the entire can.Let soak for 15minutes, then go for highway driving. Put one can of Seafoam in your gas tank.

[@mtmike5335]

Perfect timing, my dude! I'm getting ready to buy the tool and kit to do this on my 2017 Forester with just over 60k miles.

[@m_k5268]

Did you get to do it on your Forester XT? How did it go.

[@ronaldebrownjr5622]

Thank you for all the of the great information!! My 2016 Forester run great!!!!

[@FlowJunkee65]

Heck of a good instructional video. Sorry, I was listening to part of this video while helping the wife around the house -- when or how often should this service be performed? Thank you! Liked and subscribed!

[@Didgeridoo42]

I just bought my 2019 Crosstrek that I've been leasing, learning to do all my own work because Subarus are just that easy, I've owned a Corolla and Altima before this Crosstrek and I've never felt this comfortable doing my own work. Thanks to Mr Subaru I'm confident I'll drive this Crosstrek till 250,000+ miles

[@jamesm.8392]

MrSubaru ( ? Jim ? ) Would you do some Eval's / Full Maint. on some late Model RU's. Some of us are not RU owners but thinking about it? Such as me . . . a 15K / 30K / 45K / 60k mi. Full Tech Eval. along with your Prof. Opinion about what you see / what you expect might happen on late model 2.0 & 2.5's would very beneficial. When all we see is repair, repair , repair . . . it's easy to forget most of your video's are for much older model's. It Just leaves a lot of us with question's like . . . Well ? . . . How much of this has been corrected with the newer Models? If anything at all? *Especially Blow-By* . . . this would be an absolute deal breaker for me. This kind of stuff is no accident . . . *after this many years* . . . this is Car Maker Sabotage IMO and as you proved in an earlier video this involves all Makes/Brands. *Cars from a century ago did not leave the factory suffering from Blow-By* This is a Mgmt and/or/both QC Willing Decision to Fail the consumer. So should we even consider buying a RU if they are going to be that much trouble? I see a lot of new Crosstrek's on the road in my area and I don't know what to think ? Slow 2.5 Eng. / CVT - Uncertain / Have they fixed that Oil Pickup Tube ? . . . and a bunch of other things you have not yet covered/seen yet. Good ? Reliable ? Long Term $35K Investment or not ? Thanks . . . We Depend on You.

[@axeya366]

Great video. Everyone with a Subaru needs to get this done more often, especially those with DIT. My 2014XT was running like choof head smoking 2 at a time. I was getting black smoke on 60%+ throttle. Normal driving you could not tell anything was wrong till you gave it some then it chugged and choked blowing smoke. I got it serviced and now it feels like a new car. Engine oil, filter, upper cylinder (SA459)cleaner. Cleaned throttle body and intake system and the Map sensor. Its like a new car now. (95k KM or 60k Miles)

[@jackd1582]

And air filter? Fuel filter?

[@axeya366]

@@jackd1582 Changed both new and was still blowing smoke.

[@jackd1582]

@@axeya366 Aha. Hesitation here did nt stop till after fuel filter done

[@wanglee21]

Do you know where to connect the top engine cleaner on the newer Ascent/Outback/WRX motors? They don't have that small hose on the top

[@charleshuffman6982]

Very good video. Thanks for posting.

[@stanp3646]

did this procedure on my 2021 crosstrek premium 6mt this past weekend. Used the kit with the metal can of top clean and the tool for the metal can. There was no way to tell how much top clean was being consumed by the engine. Could not see through the metal can. What I did was wait for the idle to get a little rough, then turned off the valve and burned it out and repeated till the can was empty. At one point the engine threw a blinking check engine light, but it went away after a few seconds after burning out the top clean using the throttle. CEL never came back. Everything went well and this video helped. Saved me some money too. Thanks Mr. Subaru.

[@JacobLambeCarGuy]

One very important question is do you know JESUS CHRIST AS YOUR PERSONAL LORD AND SAVIOR?

[@dx3200]

Another great video. One question. Whenever you do such maintenance service videos, can you please trust at what mileage the given service should be done. That would be very helpful. Thank you.

[@RipJawn]

i'm a subaru guy myself, i never have done this kit to any of my subarus.. should work with my old subies.. 89 XT6 and 90 Legacy

[@ronniewilliams3691]

The video I so needed and wanted!

[@slowawdyoutube8372]

I would love to see a chemical comparison of the Subaru brand chemicals and the market competitors. I would say seafoam and something like HEET or Gumout which come in at a fraction of the price

[@golding69]

I wish MrSubaru was my car's mechanic! (BTW, i think the cleaner's bottle black cap may have fallen off around minute 18:00" ) Thanks for all the Subaru technical info you share!!

[@AquariusRising]

Thank you for this! I just called my Subaru service center and asked them if they could do this for me.

[@robertshaw9437]

I reached out to my Subaru dealership in Nova Scotia Canada to buy the engine maintenance kit. I was told that they do not sell these kits to the public, they are stocked for their service techs only. As a workaround I went to Car Quest and the rep helped me identify similar or better products (i.e. higher PEA content) and used these items with great results.

[@wanglee21]

The plastic bottles are discontinued. They we replaced by the tin cans. I'm assuming they still have stock of the plastic ones tho

[@nwinawe]

Great helpful instructins!! Thanks!!

[@nancyoffenhiser4916]

Great video! Thank you!

[@mustang3.0]

Great video ! Just subscribed. Now all I need is you to preform this on my WRX ! LOL

[@Mikki-Media]

Lol, the intro being the ez30 timing cover reminded me of the "fun" time I had rebuilding mine

[@rickybrown451]

Great Video!! Thanks!!!

[@cihanugur8973]

Thank you Mr.Subaru. I used this maintenance kit , but mpg dropped by about %25-30 after.Not sure if it was a coincidence.Been having low power issue for last 2 years , still have it. 09 Outback , 215K mile on it. New Cat , new O2 sensors , New spark plugs , new ignition coil pack , new knock sensor , timing belt was replaced 3 years ago.. Please comment.

[@LordFetustheGreat]

I have used Liqui Moly Pro line engine flush before every oil change, engine has 160k miles (2005 legacy 2.5 N/A), the engine has never given me any issues for the past 10 years of ownership. Car itself is totally stock and has lost 2 HP since 2004, had id dyno'd last month. Costs 15 dollars a bottle;)

[@williamsanter125]

The FA engine has port injections so the carbon buildup isn't an issue if you use high detergent gasoline. I don't think engine flush does anything for carbon build up on the valves. Should help keep the rings from getting stuck though.

[@paultice610]

Great video I should probably do A throttlebody cleaning on my 09 Subaru Forrester I don’t know if it’s ever been done I’ve bought it on the cheap and been working on it for the past year and a half but it’s always been drivable the whole time and I’m averaging 22 miles to the gallon mainly just normal higher mileage maintenance stuff have 158,000 on it

[@kathykaura7219]

This makes me want to work on my Subaru and I don't even have one yet.

[@nigozeroichi2501]

Figures, bought a 2011 Forester and thought this might be worthwhile to give it a clean, BZZZZZZZT cleaner kit no longer available from the links, haven't checked the dealerships yet.

[@bmwrules28]

Thank you sir!!! Great video as always. Quick story to share, I went to the only dealership locally here in Las Vegas and the parts guy…gave a heck of a hard time with a bunch of BS stories. Supposedly they don’t sell the maintenance kit to the public blah blah so he tried to sell the wrong Carbon cleaner with the tin bottle (not the plastic one). What a headache but thankfully all the parts with part number checked out when I searched online to confirm they weren’t the wrong ones. I even told that clown if we use the wrong bottle/parts we can damage the engine/fuel tank or worse. Anywho, for others make sure you have the part numbers (as a back up just in case they claim they don’t sell the maintenance kit as shown in the video.) For everyone, follow Mr. Subaru’s advice EXACTLY as he says and this service should be excellent for 30, 60, 90k. I bought the OEM throttle body mounting gasket as well just for piece of mind. The Subie just hit 60k so I’m going to change the spark plugs right after performing this service and the car should run like a champ. Mr. Subaru happy new year! Thank you always for golden advice and for helping everyone maintain the Subaru. Cheers! Update: Whew this job for the DIT 2.0 Turbo (I have a 17 WRX) took me 8 hours or so to complete yesterday. To reinforce what Mr. Subaru said he did make it look easy haha. But I did this from my garage and that was from start to finish. The items slowing me down was the intake duct connected to the throttle body. It was stuck (literally) and wouldn’t budge so I had to use some WD40 and carefully/lightly sprayed on the top to loosen it/remove. Also I drained about 3 quarts of engine coolant since I completely forgot to get the clamps to stop the preheater hoses when disconnecting from throttle body. You’ll definitely want to have the long needle/hose grip pliers to do remove them. I was thanking Mr. Subaru (in my mind and right now) when taking each hose off because you don’t have a lot of room to work with and that really saved me a lot of time. As well the special tool to slowly connect the top engine cleaner is strongly recommended. Why? I was lucky not to get any DTC (Check engine light etc) but notice how he carefully opened the valve to slowly pour 1/3 the bottle each time. You don’t want to risk damaging the engine, spark plugs, etc by putting too much in at once. I cannot stress enough: Follow his advice and watch the video/take note of the tools and how he removes/installs the each part. You must have patience and tolerance to do this job. You can’t risk damaging the car and then creating more headaches. Finally, Mr. Subaru thanks again! Do you a Venmo account? Or Google Wallet/Apple Pay cash? I’ve watched your radiator/coolant change video, spark plug change for DIT 2.0, this video, dude you’ve helped me become a trainee mechanic haha. But I’d like to support your channel even more if I could send some moola directly to you let me know. This was a long job for me but every 30k for this, goodness I know this Subie should last 200k-300k thanks again for your videos! Keep up the good always!

[@briancoverstone4042]

May I ask where you purchased the throttle body gasket from? I can't seem to find what the part number is, and searching on google seems to reveal very little. Kind of odd.

[@jackd1582]

Great comment

[@Braap708]

robert is the subaru man.

[@davetravels9273]

I just use the CRC direct injection and turbo cleaner. Same procedures but it comes out atomized and you spray it before the trottle body so it does two jobs without any major screwing and virtually no risk of hydro locking. I follow that up with a bottle of gum out (pea) fuel system cleaner. Does great and costs less than this.

[@petset77]

I'm checking out this video to see if the spray intake cleaners are safe for Subaru engines. My wife's 2013 Crosstrek runs great with 150k miles on it, but recently has the P0420 code. Gas tank cleaners haven't worked, and I'm just learning the downside of direct injected engines.

[@davetravels9273]

@@petset77 yes, it’s hard to clean them once they gunk up. It’s important to only use top tier, name brand gas that has more detergent, which helps prevent a lot of build up while off brand/grocery store gas has around 90% less detergent. You also want to use fuel system cleaner with PEA every 5,000 miles. Otherwise you will eventually need to have the carbon mechanically removed using walnut shells for example, which also requires removing the head, an expensive procedure. But the spray that goes into the intake might reduce it by some so that the code goes away. 🤞🏻

[@coupedayville4038]

This is a lot like the procedure we use to do with sea foam on cars and 2 stroke boat engines.

[@El-Fartomatic]

Exactly what I was thinking. One can, 1/3 each section of cleaning and done.

[@dannyx117]

Gonna try this on a 2001 Legacy Outback

[@shamalanon-time4209]

Thanks for the great video. At what mileage should this be done please??

[@depace311]

A word of caution - I had the WQW-58 recall (which included the top engine clean) performed on my 2014 Forester 2.0XT and the carbon/solvent sludge that went through the combustion process actually clogged the cats which the dealer then had to replace under warranty.

[@depace311]

@@Chippy569 my subaru had the CEL illuminated for (going by memory) misfire and when they were doing the recall for that campaign, they did a leakdown test and the results were out of spec. that's when they scoped the top end and found carbon build up and followed subaru's internal memos regarding the top engine clean.

[@rock962000]

Top engine clean is notorious for fucking up cats.

[@depace311]

@@rock962000 Well someone needs to tell Subaru because they have an entire service process with an OEM tool to use their own Subaru-branded Top Engine Clean on motors that are exhibiting certain issues.

[@rock962000]

@@depace311 if you think about it, all the carbon you're cleaning goes straight through the cat/cats. It's a pretty harsh chemical and I don't really recommend doing it unless the vehicle is a high mileage car (90k+ miles)

[@depace311]

@@rock962000 i absolutely agree with you - if your motor has carbon buildup issues due to DIT it should be disassembled and cleaned with a walnut blast (like Audi and BMW do). Unfortunately if you car is under warranty by Subaru, the top engine treatment is what they're going to do - unless they have revised their processes in the past ~4-5 years

[@rcdyer]

I only have 63,000 miles on my JB25 so shouldn't need to do this just yet. I'll save this video though for future reference! Thanks

[@clintsturts1179]

Thanks!

[@michaeldickerson873]

Thanks Mr Subaru! The best teaching video I have seen to date. Shares knowledge, tips and insider info-inspires confidence! I have a 2011 Legacy Limited 2.5 (not a turbo). With 168,000 miles and recent head replacement/Drive belt/water pump kit. Ouch, $2100…. While my air intake setup is a little different, can I use this same kit and procedure for my Legacy limited? Thank you for answering questions.

[@jojopojo9516]

As always, very insightful and helpful. I don't know why I thought all the FA / FB / CB engines were port injected. It would have been nice if a borescope could have given us a before and after of the valves.

[@marksandstrom4248]

XT WRX and Ascent FA20 and FA24 engines are definitely direct injected, thus "DIT" on my XT's engine cover

[@dingleberries360]

Fb20 is port injected

[@AbleMable]

@@dingleberries360 FB20B = port, FB20D = direct inject

[@williamsanter125]

@@marksandstrom4248 I'm pretty sure those are FB engines.

[@bradq2769]

Dude, you are awesome! Can you move to Utah? We need honest Subie lovers like you.

[@snoorani1]

You are amazing! Thank you so much!

[@MrSubaru1387]

You're so welcome!

[@andytennant4094]

This was a good video, I just spent several hours today removing the egr valve and cleaning it with wd40 and an old toothbrush hoping it would clear the check engine lights since it’s pulling an egr related code (P0400 EGR AFlow.) I put everything back together and nothing changed. Went back to the auto parts store thinking hooking the car up to a computer would clear the lights and they’d stay off but they came back on after 15 miles or so of driving like they did when nothing was fixed. It’s pretty depressing to deal with this on a car that’s close to but still not paid off.

[@daubinks]

this seems like a good idea for my 95' with 270k on it :)

[@davidd166]

Need one of these for my 14 Impreza

[@keilet]

Thanks for the excellent info! Could you please update links for the parts? The one for the siphon tool claims it's for metal cans only. (They do provide a part number for the plastic bottle tool) The entire maintenance kit is also labeled as being discontinued. Is that the case and if so does subaru have an alternative yet?

[@paulwatts9910]

Planning on replacing the cat system and O2 sensors on my manual 2010 Forester with 250K. Going to perform this service 1st so as not to clog the new cat system.

[@dj5752]

Nice video. I enjoy all of them. I have a 2016 impreza, 2018 premium Forester. 2023 Crosstrek. So I watch your channel a lot. Did the check engine light go off by itself? Or did you have to do it. Please let me know. Thank you.

[@YummyBaer]

I didn’t see you put that throttle body gasket on there. Did you put one on there? Thanks for posting this video! 🙏🏽

[@christopherferguson4891]

This is fantastic, do you have a version of this video on a turbo version? I have a 2021 Ascent. Also at what milage (interval) is this recommended?

[@cmazz...]

It this the same for a 2024 Outback? Great videos thanks for sharing your knowledge

[@pauljohnson1404]

All DI cars have the same problem, it can get really bad to a point where the carbon build up is so much it can bend or break a valve

[@spelunkerd]

Can you tell us about whether you agree with the theme of replacing the in-tank fuel filter regularly? It seems like a huge amount of work if you don't replace the whole fuel pump module at the same time.

[@seriousfaith]

Excellent- should someone increase the interval for cars with high idle times in very cold climates? My 2018 only has 10k on it, but it idles a lot in Fairbanks.

[@Jordan-ql6tm]

Really enjoyed the video, haven't done this on the ole '11 sti with 120k on the clock should cruise on down to the stealership for a service.. About how often would you recommend doing this?

[@oregonfelder1]

I know you mentioned preventive maintenance long-term and thought you’d discuss catch-cans and AOS systems. I know you’ve touched on them in previous videos, but have you done a full break-down of them? Of course each manufacturer is going to tell you why their’s is best, but it would be nice to see a comparison by a proper technician on these motors. I personally have the Cobb AOS on my 2020 WRX installed before 3k miles.

[@brianmanguso4126]

I wanted to ask the same thing. I’m getting a new wrx soon and I’m debating if I should get a Aos right away or maybe just stick with this method. I plan on keeping it stock until the warranty ends.

[@jeffreygoss8109]

Playing armchair mechanic. I would have loved to have seen a bore scope of the valves before and after

[@MrSubaru1387]

Yeah, I wanted to, but the grid pattern behind the throttle body prevented this. Would have remove the intake, but twice for a video... Maybe in the future. 👍🏻

[@heyaisdabomb]

@@MrSubaru1387 Please do because I'm debating between this and getting the upper body walnut blasted. Are you also concerned about where this carbon is going, i.e. the catalytic convertor?

[@MrSubaru1387]

That's part of the smoke. Increasing RPM pushes it out/burns it, but there's likely some residue left in the cat/cats.

[@danielgeci4513]

There is another video on a non-suburu where the guy scoped before and after the process of carb cleaning. The effect of the cleaning was minimal at best. Most of the cleaning it did was prior to the actual combustion chamber. It only showed a noticeable difference in one combustion chamber and the others showed no reduction in carbon and actually showed even more fresh carbon buildup than prior. You could tell it was fresh because it was wet and glossy still. Maybe if you ran it thru the system routinely it would clean more but one pass didn't seem to do anything on a direct injected engine

[@TheOmegaFleet]

​@@danielgeci4513 the biggest problem on DI Subarus is the intake tract before the valves I thought. That's where all the EGR gasses and buildup gets stuck as there is no fuel spray to wash the back of the valves and intake diverters.

[@theronsmith8244]

Thanks for sharing

[@valdius85]

Thank you

[@todtalk3912]

the only thing id do differently, well not differently just additionally, is do an idle re learn after its all said and done just to ensure the entire system is re programmed at each rmp milestone it logs. Id recommend any one do this (at least 2 of the 3 steps which still be a huge improvement, just gotta be slow if you do the 3rd step. also buy it online, so theres no record for ur insurance company to see you just bought this at the dealer and then hydro locked your car. Wait for a rainy day, and then say you have no clue what happened, you were driving down the road and the engine locked up after a huge gust of wind and crazy down pour of rain hit your car you felt the engine shut off. My opinion, your insurance will look for any way out of paying you, so as long as they cannot prove indefinitely in a court room you did something than you can never be criminally charged at least.

[@denniss1211]

As normal ... outstanding advice....I have 9K on my 2021 Forester. If using something like AMSOIL gasoline additive, when should I perform this routine. Please do not retire...we need you.

[@MrSubaru1387]

30k miles would be the recommendation for the upper engine/carbon cleaner.

[@denniss1211]

@@MrSubaru1387 thanks

[@kenbo80]

Your channel is a life saver, THANKS! The top cleaning kit SOA868V9431 is discontinued and the remaining stock is going for$ 60-80 bucks. Are you aware of any comparable aftermarket ki g?

[@Tom-ej8bb]

I would assume an oil change would be a good idea afterwards? T Y. I don’t have a Subaru but son does. A non turbo! I have a 1.6T in my crv. I am concerned about doing a service like that on it due to the turbo! Wish you were in Michigan. I would trade my Crv in for a non turbo in a minute!! Your a great mechanic. I was a long time ago only for a short time so I never considered myself a true mechanic. I appreciate your perfection!!!👍🙏

[@rickmbp]

Great video!! Quick question… what about my 2015 Outback 3.6R? Does this procedure need to be done for that engine?

[@petset77]

Excellent tutorial. I have one question concerning the cleaner (and tool). Do you think the Subaru labeled cleaner would be more suited to this engine than any of the off the shelf auto parts store aerosol cleaners, such as spray Seafoam cleaner? (or majorly different at all?). There are others, of course. These would already be atomized via the spray, and according to some generic video tutorials, a helper on the throttle keeping the engine from stalling (and potentially vapor-locking) would help negate the problem. This is the first time I've seen this particular video, just discovering (and subscribing to) your channel less than an hour ago. ....one would think that auto makers who utilize direct injection would have intake cleaning an included warranty maintenance item since that's a built in problem. My wife's Crosstrek has been a generally reliable car that gets great mileage (due to the GDI), But I've never considered intake cleaning since I've mostly driven carbureted vehicles or Tacomas with the dual injection. Anyway, thanks for another great video, and any input about intake cleaners will be appreciated.

[@zongquantang]

Thank you Mr. Subaru. Could you please help to indicate the best spot (where I suppose a vacuum line connects to the intake manifold) to connect and feed the value cleaner into intake manifold?

[@stevedock6211]

Great video. Which vacuum line is best used for a 2009 WRX? I heard the brake booster is not optimal because it only gets cleaner in half the manifold. Thanks

[@carlosr7723]

I need to do this on my legacy

[@notasgoodasapple]

Hey man! great video just curious if I wanted to change my PCV valve does it matter if i change it before or after the top engine cleaning service.

[@elcastigadordevenus]

Great professional.

[@johnhoog]

Mr. Subaru, you are a lifesaver for all us Subaru car owners.. I own a 2017 Subi Impreza that I am very happy with.. It is very reliable and runs likes it still new after 120K miles. I am about to replace the spark plugs, just wondering right now if that is really neccesary..??

[@williamsanter125]

Subaru recommends changing plugs at 60k and 120k. Normally iridium plugs are good for 100k but I'm thinking maybe it's because Subarus use a waste cycle spark system so it's firing twice as often.

[@longphan7568]

Just an update since im trying to clean mine. The top engine mount tool part# is SOA868V9432 which will work with the new style top engine bottles.the part# ending with 30 is longer available

[@oladapoaloba]

Nice vid my friend😊👍 can they work on diesel engines as well? Cheers😊

[@billyquinn9378]

You have to be careful when doing this type of service, you can very easily fry some valves if you rush it. I have used similar products with some success.

[@charlesolinger6250]

My friend says it's frequently changing oil but he uses Amsoil Ss oil. I have switched to it but my car is Pontiac firebird.

[@jermainemorgan171]

Very nice. Can you not put on back coolant hose and it run ok? Cause were I live is in the tropics.

[@dogburrito]

I did a carbon valve clean treatment using a CRC product containing PEA. The car began throwing lean codes and increased HWY mpg from 23 to 26. The improvement occurred over about 1500 miles. The only problem is the car throws a code every 600 mile or so. So far it's been left bank lean, right bank lean, and a CAT code

[@sugarbooty]

Let me know what comes of it, how many miles are on the car? Might need a valve job

[@dogburrito]

@@sugarbooty 250,000 miles. The engine runs smoothly with the exception of some hesitation and the occasional stutter (once every 2 weeks). Stuttering occurs at any speed and can be a split second to a few seconds long. The stuttering is like a 50-80% power loss during which the engine runs very roughly.

[@sugarbooty]

@@dogburritointermittent issues like that are the worst, it can be any number of things. A leakdown test will tell you if it is the valves or not, had a kind of similar issue after seafoam with a JDM EJ20 but a lot worse. Slowly it got worse and worse, from occasionally bogging down to only being able to use it between 3k and 4k rpm without it just misfiring like crazy and throwing lean codes. The LTFT and STFT were both maxed out. Unfortunately I don't know what the issue was or is this is the same issue you're having, I just swapped the engine back to an EJ25 I had sitting around in an old car but i suspect the lean condition overheated some stuff and the valves are toast. That's what I get for buying someone's beater car as a daily

[@JamesGodish]

This is great. Will this work on a 2003 Subaru outback?