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Valve Stem Carbon Build-up from Oil in DI Engines #5290001 12/10/19 03:52 AM
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paoester Offline OP
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This will make you want to use a low saps oil!

Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290003 12/10/19 04:02 AM
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LeoStrop Offline
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Originally Posted by paoester
This will make you want to use a low saps oil!


But will that eliminate the problem? I'm not so sure...


Chevrolet Kadett EFI '94 (Neat ethanol) - Shell Rimula RT4X 15W40

Honda Fit '09 (FlexFuel) - Shell Helix HX8 5W30 > Motul 6100 SYN-nergy 5W30
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290005 12/10/19 04:05 AM
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Too bad weren't shown a TGDI camera-shot, having 40-50K and using Modern Engine exclusively.


19' Hyundai Santa Fe 2.4 GDI - Valv Adv. 5w30 / OEM Oil Filter / 6oz Liqui-Moly
20' Kia Soul X-Line 2.0 Multi-port / Pennzoil Gold 5W30 / OEM filter
04' Colorado 3.5 Castrol Edge 0W40 / K&N filter
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: Triple_Se7en] #5290018 12/10/19 04:52 AM
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paoester Offline OP
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Originally Posted by LeoStrop
Originally Posted by paoester
This will make you want to use a low saps oil!
But will that eliminate the problem? I'm not so sure...
Great question. I suspect its caused by higher saps levels, based on some engineering statements made over the years. You're right we can't be sure.

It is speculated that Valvoline is putting some of its patented "Valvoline Premium Blue Restore" low aniline point oil patented chemicals in Valvoline Modern Engine oil. Although their Restore product mostly affects the ringlands on engines.
https://www.bobistheoilguy.com/foru...arbon-cleaning-valvoline-premium-restore
It dissolves carbon: https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4995896/1

Several years ago Lubrizol thought valve deposits in DI engines were at least partly caused by ash combined with carbon, getting sticky. I'm not sure if they were ever right about it. They might be.

Originally Posted by Triple_Se7en
Too bad weren't shown a TGDI camera-shot, having 40-50K and using Modern Engine exclusively.
That would make it correct for sure. Maybe every 5 years we should run Valvoline Premium Blue Restore oil through the engine and see if that helps. Some would circulate via the PCV into the intake presumably from oil mist. Enough to do something up there.

Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290039 12/10/19 06:10 AM
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BMWTurboDzl Offline
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About a decade ago someone around here provided a copy of a presentation from Lubrizol which stated the low-mid SAPS oils would not generate the same amount of carbon buildup.


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290057 12/10/19 06:37 AM
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buster Offline
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In 2012 Mobil told me that is why they lowered the TBN and SA levels to .8. I would have loved to have seen the intake valves of my Mazda before I got rid of it as it only had M1 EP 0w20.


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290061 12/10/19 06:45 AM
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skyactiv Online Content
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My wife had a Mazda3 with a Skyactiv engine, hence my user name. She bought it new. The Mazda got it's best fuel economy when new and didn't do as good when it had over 20k on it. I think deposits on the intake valves played a role. The car still for great gas mileage regardless.


Wife: 15' Audi A4 quattro 6 speed manual
Sold: 13' VW GTI 3 door 6 speed manual
Me: 18' Elantra Sport 6 speed manual


Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290063 12/10/19 06:48 AM
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It's not a definitive solution but if I had a DI engine I'd invest in a catch can and regular intake cleanings. But how many avg consumers know about/want to be bothered with this, IV build up.

Last edited by Mad_Hatter; 12/10/19 06:51 AM.
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290066 12/10/19 06:48 AM
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A while back we were blaming the gasoline for the deposits.


If you want the job done right......do it yourself.
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290070 12/10/19 06:51 AM
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N Heat Offline
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Ive been learning alot from reading here lately about the DI engines and oil issues. How do you know if you have DI engine? My most modern vehicle is a 2012 4runner and Im assuming thats not DI.

Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290074 12/10/19 06:57 AM
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While oil choice is obviously important in combatting carbon build-up....it's also obvious that DI was rushed to market before it was ready for prime time.


'Journalism is Dead'
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: paoester] #5290075 12/10/19 06:59 AM
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What a bunch of malarkey.

This is an assemblage of oohs and aahs along with an "authority" that tells them how bad it is.
None of these cars are stated to have any operational issues.
If they did, and if it could be linked to carbon build up on the valves, it can be easily remedied with an $11 can of CRC intake cleaner.

False concern for a non issue that can easily be addressed.
Thanks Valvoline.

And ironically, Valvoline makes a good product. Too bad the marketing department thinks this is a good means to justify their salaries.


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: N Heat] #5290076 12/10/19 07:04 AM
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PWMDMD Offline
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Originally Posted by N Heat
Ive been learning alot from reading here lately about the DI engines and oil issues. How do you know if you have DI engine? My most modern vehicle is a 2012 4runner and Im assuming thats not DI.


The magic Google machine will tell you. Seriously, that should be one of the easiest things to find out about any vehicle. Not only is a 2012 4-Runner not DI...not even the 2020 4-Runner is DI.

I have one DI engine (Honda Pilot) and one D-4S (RX350) engine. My guess is the RX350 engine will do significantly better over the long term as far as carbon. This is one more reason I may not keep the Pilot long term....

Last edited by PWMDMD; 12/10/19 07:07 AM.

Current: 2019 Lexus RX 350 (Mobil AFE 0W-30 and Toyota OEM Filter) and 2018 Honda Pilot Touring (PP 5W-30 and Mobil 1 EP M1-110A Filter)
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: skyactiv] #5290080 12/10/19 07:11 AM
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buster Offline
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Originally Posted by skyactiv
My wife had a Mazda3 with a Skyactiv engine, hence my user name. She bought it new. The Mazda got it's best fuel economy when new and didn't do as good when it had over 20k on it. I think deposits on the intake valves played a role. The car still for great gas mileage regardless.


That's odd. Mine stayed the same for almost 5 years/60k miles. I used M1 EP only which has a SA of .8.


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: Valve Stem Carbon Build-up from Oil in DI Engines [Re: buster] #5290081 12/10/19 07:14 AM
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PWMDMD Offline
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Originally Posted by buster
Originally Posted by skyactiv
My wife had a Mazda3 with a Skyactiv engine, hence my user name. She bought it new. The Mazda got it's best fuel economy when new and didn't do as good when it had over 20k on it. I think deposits on the intake valves played a role. The car still for great gas mileage regardless.


That's odd. Mine stayed the same for almost 5 years/60k miles. I used M1 EP only which has a SA of .8.


It's odd because one can't intuit carbon buildup based on lower fuel economy alone. Unless you look directly, you just don't know and that statement is meaningless.


Current: 2019 Lexus RX 350 (Mobil AFE 0W-30 and Toyota OEM Filter) and 2018 Honda Pilot Touring (PP 5W-30 and Mobil 1 EP M1-110A Filter)
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