HaveBullDogWillTravel

OMG! Where do you come up with this BS? You sir, are grossly mis-informed and sharing mis-information is NOT what this forum is all about. I sincerely hope others here can see it. Good Grief!

ELEVENS

This is news to me. May I please see the UOA's that support your conclusion?

AudiQ5sleeper

you dont really understand carbon build up do you?

AudiQ5sleeper

Failure from excessive exhaust temperatures or hot shutdown of
engine results in carbon build-up. It is recommended that you idle the
engine for 2 to 3 minutes to cool the bearing system before shutting
down. Turbine end heat soak into the bearing housing results in oil
carbonisation and corrosion of the bearing system. The main damage
occurs to the shaft seal ring and grooves, turbine end bearing and
bearing housing oil drain cavity blockage.
Carbon build-up can be caused by:
• Hot shutdown of engine.
• Degraded oil quality carbonising in service.
• Infrequent oil change intervals causing oil breakdown in service.
• Air and gas leaks.
• Faulty fuel injector pump/injectors

Remember what is keeping the turbo charge lubricated...OIL!!!!

ELEVENS

I have a database of over 100 UOAs on the Audi 4.2 FSI RS4 motor and although running extended OCIs does increase fuel dilution on the FSI motors, I haven't seen evidence that it increases carbon buildup. Have you studied the VAG FSI patent 6866031? That's the best place to begin learning about FSI and CB. It contains a half dozen or more patents on CB mitigation. OCI is not one of them.


UOA = used oil analysis
OCI= oil change interval
CB=carbon buildup


Here's a link to download the FSI patent: http://www.mycar.net/volkswagen/6866031.html

ELEVENS

I just googled your post. Nice job cut-and pasting.

rdA4WtQ5

Some observations from this and many forums, it appears that short duration oil changes, catch cans, addition of fuel injection cleaner, sea foam treatments and even top tier premium fuel usage makes no difference whatsoever to carbon build up when scientifically evaluated. What does make a difference is the way the vehicle is used, short trips only versus highway usage and spirited driving when the engine is hot. The carbon problem is seen most often in RS4 4.2 engines followed closely by S4 4.2 engines and 3.2 engines. The problem seems less common with the first vintage EA113 2.0T and much less with the EA888 2.0T and almost non-existant with 3.0T. It appears More cam intake/exhaust overlap makes it worse and forced induction and higher fuel rail pressure systems makes it better.

AudiQ5sleeper

so your saying false info? lol

HaveBullDogWillTravel

I'm pretty sure I understand more(a lot more) than you.
When did we switch from carbon build-up in the head(intake and exhaust valves and their respective ports) to carbonizing the shaft and bearing(s) of a "turbo charger"?
Go back and read the entire thread and you'll soon realize that you are posting BS about something that has nothing to do with the original topic.
And even if we were talking about turbochargers and correct oil spec and oil change intervals the info you have provided

"when your turbo charged you have to change your engine oil every 3500 to 4500. dont listen to anyone at the dealers telling you to change your oil every 10k miles. my dealer changes my oil every 4500 miles on my 2012 2.0T Q5. My friends are boosted and they need to change their oil every 3500 to avoid carbon build up. And we are talking about 400HP to 500HP turbo charged engines which has carbon build up like theres no tomorrow. 10k on a non boosted car is fine."

is incorrect.

I'm going out on a limb here but I'll take a guess and say that you've never torn down an internal combustion engine and/or put one back together so that it actually started and ran. Correct?

rdA4WtQ5

Post does not address synthetic oil that we run not being affected by heat soak and coolant pumps that run when our cars are off that our cars also have. lol