Also, don't forget the oil - fully synthetic oil will deal better with the high tempertures created in the turbo.

As mentioned, oil circulation stops once the engine is turned off, non synthetic oil can "bake" and block the oil ways cuasing eventual turbo failure.

I always let my engine idle for a couple of min when I stop - turning the engine off is the last thing I do before I leave the car.
120,000 miles and no turbo problems - I hope thats not the kiss of death!

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'02 X5 3.0d, Auto, Topaz Blue