sparkhill

Independent shops can work on cars too. silverRS4 looks like he knows what he is doing. If he broke something, the dealer would not fix it for free. But pulling the manifold should be fine.

silverRS4

<center><img src="http://i299.photobucket.com/albums/mm303/silverRS4/42FSIpg9.jpg"></center><p>

Mr Paul [T-28]

haha

daveak05

The oil vapor recirculating is making the carbon already present tacky. Need to find out what's causing the carbon buildup. Some known and likely sources, but this is excessive and happening quickly at low mileage.

RI A6

I don't know where you got that information, but it's dead wrong. Oil analysis shows a considerable difference between factory oil and Castrol TXT in all areas of formulation. Best guess, and some information from England, indicates that the factory fill is most likely a derivative of Fuchs Titan GT1 5W30. Factory fill is most definitely a 5W30 and not a 5W40 oil.

Oil analysis also shows the issues that your are seeing with Mobil 1, Castrol 5W40, Castrol TXT 505 5W40 ... etc. Don't expect your valves to look any better with TXT, unless you change the oil every 3K miles.

I hate to say I told you so to the forum, but 2 years ago I told everyone that these oils are killing this engine. An oil analysis will tell you what in your engine is currently compromised.

If you care to trust your engine to a professional, I'd recommend that you have Terry Dyson perform independent oil analysis.<ul><li><a href="http://www.dysonanalysis.com">Dyson Analysis</a></li></ul>

RI A6

Unfortunately, none of the Audi 502 and 505 oils are in this class. RLI Biosys 5W40 does.

RI A6

That's why there are specific standardized tests for this for large diesel engines, and engines with turbos. If you don't believe, then here is some technical data.

http://www.savantgroup.com/papers/TEOST.htm
http://www.savantgroup.com/TEOST-1.htm<ul><li><a href="http://www.savantgroup.com/TEOST-1.htm">TEOST testing</a></li></ul>

daveak05

It's not a matter of not believing oil deposits are present or can eventually carbonize. But this heavy and early carbon buildup is almost certainly not from the engine oil. There's another cause(or causes).

We already know what they are, combustion process byproduct. What is causing it to be so bad in the RS4? Is it entirely DI design related? I would tend to discount that. Is it driving a high compression ratio car improperly(short trips, low RPMS)? That may be contrubing in some cases. The fact is we don't know...and the techs don't seem to know either...and Audi is not telling if they do know.

But one clue should be Audi pounding home the theme of using only a proper gas. This has nothing to do with engine oil, Scott. Not in this case. Try and wrap your mind around that instead of doggedly clinging to your 'engine oil is to blame' pet theory.

Hint: carbon fouled vs oil fouled spark plugs.

daveak05

For you to declare(based on your limited oil knowledge(compared to the oil professionals) and your equally limited and entirely unscientific UOA's), that Audi factory fill and approved oils are "killing these engines", is entirely unsupported by facts, to say the least. Yet you persist in this?...?? This is bording on obsession.

RI A6

These are not my pet theories. They are widely held opinions in the automotive oil industry concerning most every DI engine in production.