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Audi A6 1998-2004, S6 2002 and later, allroad 2001 and later, rs6 2003 and later (C5) Oil leak on drivers' side & oil in the bi-pipes leading to intercoolers

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Last Post: Mar 9, 2010 9:33 PM Last Post By: gemini
Ginga

Posts: 22
Registered: 11/09/05
Oil leak on drivers' side & oil in the bi-pipes leading to intercoolers
Posted: Dec 25, 2009 1:57 PM
audi , allroad , 2001 , oil , leak , intercooler , air , intake , 2_7t
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Hello I am currently replacing the timing belt on my '01 Allroad (tip, 2.7T, ~100k miles).

I noticed two things I have not seen on my previous Audis and current '01 S4:

1. oil leak engine left side: not exactly sure where it is coming from but it seems to drip through the engine mount, down on the sway bar and then on the floor; trying to localize the leak is hard because of visibility. It does not fell/look/smell like engine oil (may be tranny?) I am hoping by opening the front while doing the timing belt I could be more useful. I read other threads mentioning issues with valve cover leaks. Could that be the issue? If so, can one replace a gasket without replacing the engine? If it's a head gasket, same question as above.

2. While removing the bi-pipe and throttle boot (I am replacing them while I am in there) I noticed there was some oil in there and my heart started to panic a little. I don't a full understanding of turbo mechanics and I wonder if it is normal to have oil in some piping that seem to be (at least I thought) for air intake / cooling only. If this is not related to turbos, could that be related to my issue/leak in para 1 above?

Thanks a million in advance for all's your help.

Ginga52
gemini

Posts: 159
Registered: 07/07/04
Re: Oil leak on drivers' side & oil in the bi-pipes leading to intercoolers
Posted: Mar 9, 2010 9:33 PM   in response to: Ginga in response to: Ginga
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1. Its pretty hard to point out one specific location, other than the valve cover gaskets, another common one is the valve timing adjusters. Clean off the engine with some greaser and a good wash, then keep an eye on the leaking. Add some UV dye next time if your familiar with the use. ($5 at napa)

2. Some oil in the intake lines is completely "normal", especially with the millage you have. Remember, your air intake comes from your turbos! Since your K03's are liquid AND oil cooled, oil does seep through the gaskets on most engines. A heavy oil build up spot is the lower lines connecting to the intercoolers.

3. Its a good idea to replace your timingbelt tensioner, water pump and idler pully as well, since youre in there.

- All the best, Evan.
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