SNIP

Perhaps the biggest and most common mistake was omitted.
5) Cool down: The turbo and manifold MUST be cooled down prior to shutdown.
 Failure to do so will roast the oil that is stagnant in the bearings
leading to deposits and premature bearing failure.

Jeff Spitzer

Bill Freeman wrote:

A bit of clarification.   This is done by idling the engine for about 5 minutes
prior to shutdown.  This is a necessary proceedure for any turbo'd engine, esp
when coming directly off of a heavy load condition, like high-speed cruising
in a car and pulling into a rest area.  An immediate shutdown is very bad.

Bill

 
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