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Synthetic oil should not carbonize and has not in turbos since it has become the standard oil fill. New turbos don't need a "cooling off" period and have not for a long time. Nevertheless, idling the direct injection diesel at the end of a trip may cause more carbon buildup in the intake, so shutting off the car as it is parked except in extreme use is the order of the day.
If I just got off from a high power drive and quickly stopped to park, idling would make sense. It is likely not so important with newer turbos. None of my last 4 turbo-diesel owners' manuals had such advice, though.
My first turbo was a 1989 Volvo 760 which loved synthetic oil when I switched over.
Last edited by Pierre Louis; 06-09-2014 at 11:49 PM..
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