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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,565
It's hard to check the condition of turbo bearing seals. It either smokes or it doesn't. If it does, it usually smokes when turbo is hot. It's nothing you can open and take a look. Nearest indication is excessive shaft play.

It can be something easy. For example, my car had distorted rubber O-ring on the end of one oil-return tube that leaked only at high revs (when lot's of oil flowed trough it).

So your turbo might be OK, but something is is leaking oil on your headers.

Left pipe is wastegate and right pipe is engine, right? It sounds weird to see oil only come from wastegate exhaust pipe. Wastegate is situate before the turbo so if turbo was culprit, there should be no oil from wastegate. Also, if engine was emitting smoke, it should come from both wastegate and exhaust.

So that leaves the most probable cause: something is leaking on the left header. When boost is on, header gets hotter and it starts smoking more.

Things to check:

Oil return pipe seals.
Cylinder base
Valve covers.

You can remove left header and take a look. Chances are, you will find lot's of oil crud on the top.
Thank you for your time,
Old 08-18-2008, 02:09 PM
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