Quote:
Originally Posted by Tejas1836
Actually his friend is absolutely correct.
Engine off water cooled correct, oil pressure zero.
Turbos be fast coming down from full boost, even loafing home maybe 50,000 rpm. Do you want your turbos spinning that fast without oil pressure?
Water cooling is there to prevent oil coking.
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Old school thinking. My M5 circulates water after shutdown. No, the turbos are not spinning at 50k while idling before turning the engine off. Nothing to worry about. I drive off without a formal warmup and shut down without a formal cool down. Have been driving turbo cars for almost 40 years and times have changed. All mine are modified. Have not had a turbo failure yet.