Quote:
Originally Posted by gresh
Yeah, the sludge can (and likely in this case, was) be caused by the turbo oil inlet pipe leaking oil. When this happens, oil is sucked into the intake.
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In cases I know, when oil feed line was leaking, oil was escaping to exhaust impeller, accumulating on cat and burning as white smoke as startup. Even if oil leaked to intake, it would burn during combustion.
When oil leaks its level drops down, and if overlooked/ignored/notdetected leads to oil loss and as the result to oil starvation (sludge form too because overstress and overheating).