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The turbo is water cooled and pressure lubricated by engine oil which also provides cooling, making it both water and oil cooled. The car must have some sensor that when I drive it hard and really get into the boost it will power the cooling fans after it is turned off, for about 5 minutes.
When I am going for economy though, the turbo is getting a minimal amount of action. Shifting at or bellow 2000 RPMs seems to be the sweet spot.
Side note. I am currently at an average of 34MPG for 100 miles that are on it so far. This warmer weather has helped a ton! :-)
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