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turbo question

I have a question about the water cooled turbos as all my experience with
turbos is from at least ten years ago. In the past the car was supposed to
idle down for a few minutes after running at speed to cool off the turbo to
prevent oil seal failure. Has water cooling eliminated the need for the
cool off period? I see nothing in the owners manual about cooling off the

Mark Switek
98 A4qt
88 90