1. What do think about BMW's Europe policy to change the Oil every 2 years (not 1 year) or max. 30.000km regardless whether is a diesel or a gasoline engine? But consider there are (were) more diesel engines sold in Europe.

  2. Mr. Engineer, I watch your channel regularly. This show, I have a question. The little, but necessary, piston ring flutter, allows blow-by during power stroke, & also a bit of oil suck-up during intake stroke? What happens to this oil in the rings when it's met by hot combust gases in the power stroke? Does it burn cleanly? How do the additives in the oil burn? i.e. Do they leave deposits in the rings? & the oil rings? & their drain holes? Then there's a question about how phosphorous, presumably burned, affects the cat?
    A response from you would be good – A full vid on these questions would be better? What would Valvoline say?

  3. This was another reason why I bought a Honda turbo instead of going German (lack of reliability being the main reason).
    My next car will be an EV, literally no maintenance, similar to owning a smartphone.

  4. gotta put my fingers crossed while driving my skyactiv… shouldn't the manufactures notice the problem ahead before making DI motors? what a scam…

  5. Can you test old oil in engine for fuel consumption every mile, comparing it with freshly oil-changed? I got 143-180 miles every 10 Gallons before oil change (synthetic), and 230 miles every (just one test) 10 gallons after oil change. A related question: does the day for oil change matter after all, not just the month?

  6. You made a mistake
    You explained the general things about engine oil
    But you forgot to say about the main causes of carbon deposit
    Remember:in all direct injections you should use LOW SAPS oil,means low sulphated ashes!
    Lots of calcium and TBN in engine oil can make a deposit as well as a bad engine oil
    For this reason:if you dont want this happensto your engine,you should change your oil type into for example: API SN RC,ACEA C (C1 &C2 &C3) and other approvals like MB 229.31 or 229.51 and also BMW LL-04
    But remember,if you use the LOW SAPS oil,you may sacrifice your engine's camshaft.because LOW SAPS oil alse means low ZDDP which is crucial for the camshaft
    And also remember:dont over-fill your engine with oil,if your engine oil capacity for example is 4 litres,it is better to fill it up just under 4 litres like 3.8 litres !!

  7. It's important to use a good fuel injection cleaner.
    Some of my favorite fuel injection cleaners are Marvel Mystery Oil which lubricates the fuel system and protects gaskets. Another really good fuel injection cleaner additive is Amsoil oil pi fuel additive which cleans all the ethanol varnish out of your fuel system in one full tank of gas also cleans the varnish off your valves and gets you up to 5.7% better fuel mileage in just one treatment.
    It's amazing we still have good quality products that can combat the ethanol delinquencies……lol

  8. It is a commonly used phrase that "diesel burns dirty". Why almost all diesel powered vehicles start emitting black smoke after few thousand kilometers? Is the impurity of diesel fuel or is it the engine oil burning (which ideally must not) along with the fuel?

  9. What I don't exactly understand is why more cars don't use port water injection? I imagine it works like port fuel injection to clean the carbon deposits, and also works somewhat like EGR to cool the intake charge and prevent knock. Seems like a fairly simple, elegant solution.

  10. Hi Jason
    Do you know if Subaru has implemented any method in their direct injection (FB20D) design to prevent intake valve carbon build up ?

  11. What if you think or know, you already have carbon build-up on your intake valves in your turbo'd GDI engine, can switching your old oil to these new oils help break down the carbon deposits, that are already in your engine, on the intake valves?

  12. Jason, with the steps you recommended of changing oil regularly, staying topped off etc, will an oil catch can or air oil separator help to reduce oil deposits even further?

  13. hi, would you reccomend something other that the oem subaru oil from idemitsu oil japan? or should that do a good job on the wrx without needed a walnut blast and just the fuel injector valve service.>?

  14. I sloved my dirty valve problem by installing a custom built oil catchment tank. After 20k km after i vleaned my intake valve, it still looks clean n free from carbon deposit

  15. So if you just pull the hose off the PCV and EGR and vent it to atmosphere, then plug the hole's in the intake manifold, you can avoid the majority of the carbon deposit problems GDI engine's are having.

  16. Brilliant video 👍👍
    I’m picking up a new VW Up gti ( UK) and have become obsessed with carbon build up in my new intake valves and have been thinking about fitting a catch can .
    What’s your thoughts ?

  17. Typically I have a favorite brand of fuel and a favorite brand of engine oil, not the same brand. Your very informative videos on sludge/carbon build up in modern engines has me thinking that maybe I need to consider fuel and lubricants that are designed to work together as you would hope a single brand might. For instance, should I consider using Shell fuel and lubricants, as an example? Or Mobil fuel and lubricants? Rather than mixing WAWA or Flying J premium fuel and Mobil 1 lubricants as I do now?
    We own a 2005 VW since new with a 1.8T, notorious for sludge buildup. To date using Mobil 1 lubricants, specifically 0w40, after 125k miles no issues. Engine runs fine, good fuel economy, only routine maintenance.. In several other VWs, all purchased new, I have used european spec oil, Motul, with similar results up to 200k. BTW after reading about the VW dealership fiasco many years ago using regular oil in the 1.8T, which caused the sludge issue, I have always supplied the engine oil when getting service from dealerships.

  18. Hi Jason
    Sounds reasonable. It's good that Valvolene are thinking about it. However the Oil Industry has the NOACK volatility index as the crirical guide that assists. This measures an oil's propensity to evaporate under heat, and is key factor in formation of GDI inlet coking. As far as I know Valvolene does not score well on that index? If Valvolene has an oil with a superb NOACK index then why keep it secret? I for one, would love to know. Penrite Ultra and Amsoil and Mobil M1 ESP 5-30 and few others do. Oils derived from natural gas so-called PAO based oils appear to perform better, ie., have lower volatility and burn cleaner in turbocharged applications. The problem is not trivial when leading car makers like BMW and Audi with iconic Ward's award winning ("best in world") engines that are coking up badly. The German engineers in these cases have been defeated by regulations and conflicted design compromises.
    Jason, please step up. Do we have to buy older cars with port injection engines? I really care about my engine's longevity and swamp it with TLC. But manufacturers have "signed off" with a measly 100,000 miles as an engine "lifetime" – it's immensely frustrating that most engine oils are not up to what's needed with these latest engine designs. We are left with options like after market catch cans, CRC inlet sprays, and so on. Of course there is the option I could surrender and just go back to a N/A Toyota.

  19. I added an oil catch can to my 2017 camaro that filters the oil out of the egr valve gases before allowing the vapors to be reburned through the intake manifold. Am I stopping the Dexos rated Oil from cleaning the valves or am I keeping the valves from becoming carboned up in the first place?

  20. as a professional mechanic I would suggest just doing oil changes every 3k miles and change all fluids once a year. this will give you the best protection against wear and wear related problems. if you keep your cars for a long time this will save you money on parts

  21. 45 years back as a mechanic we often removed cyl heads and decoked head and piston prohibit around 60000 miles which gave the cars a new life next time it was new rings & bearings oil does get past the piston rings Rovers Rolls used to say topping up oil is normal Today compression is higher + better oilsRon N Z

  22. Ok i have a question for any wrx owner. I drive a 2018 wrx fa20 dit. 11k miles on subaru 5w30 oil. After watching this video i would like to try the valvoline 5w30 oil. Does anyone else use this oil? Will it void a warranty? Would using this oil help to better protect my wrx for the long run? Or should i just keep running subaru 5w30? After 2k miles on the subaru oil the car is a bit sluggish as if the oil isnt doing its job. Any tips or answers or suggestions is greatly appreciated.

  23. Does anyone know if the modern Atkinson cycle used in many GDI hybrids helps prevent carbon buildup since the intake valve is open during part of the intake stroke and thus pushes some injected fuel to the back of the intake valve, or does the fuel injection always happen later in the compression stroke after the intake valve has closed?

  24. Another factor in oil for direct injection engines is the Noack rating. Google noack oil ratings for direct injection

  25. Looks like they paid you a lot of money to advertise their oil. I personally have used it in three different cars and all of them where burning it like crazy. I would notrecommend Valvoline at all. There is way better oils to choose from.

  26. Thanks for the interesting and informative video Jason. I just got a 2019 370Z that has the port-injected VQ37VHR engine and I'm going to install oil catch cans in the PCV line to reduce deposit buildup in the intake tract that's upstream of the injectors. I use Chevron Supreme and am going to dose the tank with the Redline SI-1 fuel system cleaner before each oil change, so I'm pretty sure that everything downstream of the injectors will stay fairly clean.

  27. Not only the base oil break down and decrease the oil performants also additive package breaks down after mileage. Modern low SAPS oils specifications have been achieved with higher quality base oils so oil do not need much additive package compared to standard oils. So first follow manufacturer oil standards than find low SAPS oil which meets the manufacturer’s standard.

  28. Only thing that seems to really have any impact on slowing it down is put a oil catch can in the PCV system filter out lot of the junk before it goes into the intake. Using good oil with lower evaporation also helps. From the charts I have seen only Redline and Pensoil Ultra have the lowest NOACK Volatility lot of amsoil websites also. The main thing is the catch can which can really make a difference.

  29. Good god this video is a god send.. I have a DI engine and i hear nothing but negative information that carbon build up on valves is a certainty and nothing can be done,, Hell this oil is a lifesaver and specific to DI engines, who cares if its advertising i'm buying it tomorrow!!! THANK YOU

  30. In another video you explain the cons of direct injection. How do Diesel engines avoid carbon buildup and run for so long since they also inject fuel directly to the cylinder chamber?


  31. Just purchased a 2017 Toyota Tacoma powered by a 3.5l V-6. I contacted Valvoline directly anf they recommended this oil in 0w20 for my engine. Anyone run this oil in their Toyota engines that spec 0w20??

  32. Thank you for explaining DI and PI. I now better understand what each one is. Now, a loaded question. In vehicles with only DI (assuming some vehicles have only DI), why do they have import valves? If the gas is directly imported into the cylinder, wouldn't that eliminate the need for import valves? Or, am I wrong in assuming some vehicles do not have port injection?

  33. Yet another excellent video, but unfortunately, most drivers are unaware of the evil being perpetrated upon their GDI engine until it begins to present with issues. Any hope for those folks?

  34. Hello Jason,
    Great explanation as always!
    Here's a thought: why diesel engines never seem to experience intake valve carbon build up (they do, but not nearly as much as gasoline engines), although they the same "recipe for disaster" i.e: egr, direct injection and turbos…?

  35. Good info. 1. Use correct viscosity oil 2. Use approved oil for your vehicle 3. Change oil often Pretty much what the old timers were doing. And that's the truth…..

  36. I’ll just buy an extra head for my GM 2.0 GDI. Switch out as needed, then clean up the old valves and put it on the shelf.

  37. Some oil will get by the valve seals. Some soot will come in through the EGR system. So oil can't prevent or clean the deposits. But you can clean it with a couple cans of carb cleaner. Fogging it. Also can clean out stuck open EGR valve and the catalytic converter.

  38. I have a 95 Honda Del sol with a rebuilt engine, transmission, clutch and a bunch of other stuff. I've been cleaning it up and cleaning up the engine, etc…. What oil would you recommend for this car since it's not a GDI Engine? Thanks!

  39. Is ester type engine oil really good for old engine? i heard it does not create sludge and able to clean your engine

  40. The only way to prevent intake valve carbon buildup on direct injection engines is to install a catch can and disable the EGR.
    And the amount of additives in motor oils varies wildly depending on how much viscosity range the oil has.
    The wider the range, the more plastic viscosity index improvers are used.
    These polymers provide zero lubrication and break down under high heat and shear causing engine deposits.
    And regardless of brand or type of base oil, they ALL use the same polymer additives.

  41. You can install a complete catch can system on your vehicle as I did to my 2019 Raptor even though Ford has port and direct injection on their 3.5L twin turbo engine.

    Nothing but clean air and fuel.

  42. Is there a list of affected engines as well as what manufacturers have done to eliminate or minimize this issue?

  43. Great info dude. I just bought a 2019 Sonata Limited 2.0 T and I’m definitely using this oil now. Thank you.

  44. I change the oil on my 2018 Civic EX-T regularity. In fact, I change it more often than the manufacturers recommended. I have just over 6,000 miles and I’ve already changed the oil twice. I also use top-tier fuel exclusively with the highest Octane available…usually 93. I know that this won’t prevent carbon build up but I hope to mitigate it.

  45. Glad you acknowledged that Valvoline supported this video. Started sounding a lot like a commercial for that particular brand towards the end. Now I know why.

  46. This simply does not pass the common sense test. You can talk about dismemberments and detergents all you want, but they don't pass over the intake valve on a direct injection engine!!! It seems like the whole auto industry is trying to avoid talking about this. The 2019 Rav4 still has a combination DI and injection, so at least the injection portion will spray gas on the intake valve. And that is why I will buy that car over the Santa Fe, or the Mazda CX-5. I hold onto cars for a long time, and I don't want carbon buildup.

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