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turbo shutdown
Turbo's get there power from the exhaust heat. This is very hot. Easily greater than 1500F. When you suddenly turn off an engine with a turbo (especially if you have been driving it hard) all this heat has to be dissipated. You can easily fry your oil. Letting it idle circulates the oil ( and water in a bmw). With low boost this heat is quickly lost. Your oil, engine and turbo will last much longer if you practice letting the turbo run at idle for a short period of time before turning the engine off. When I was really into this stuff we would let things idle till we could no longer see the exhaust housings glowing red. Unfortunately that is not easy to check on an automobile.
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