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I agree with MCR. Besides, Porsche is not the only car that suggests 15k oil changes -- there are many others. And most of those don't take 9 quarts of oil -- the more oil the car has, the longer the oil itself will last.
If Ford or Chevy can engineer a car to go 7.5k between changes, who's to say that a Porsche that costs 3 times as much and uses twice as much oil can't go 15k between changes?
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