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Oil Consumption

Engine

Model: 911 Carrera S, Year:2009, Mileage:9235, Type of use:Street use only
Should I be concerned about my oil consumption?For the last approximately 4000 miles I have kept meticulous records of oil consumption. I average 675 miles per quart.My tail pipes are black and maybe a little sooty. The dealer tells me it is normal and my owner's manual states it is within tolerance: "...up to 1 quart per 622 miles".Have you received any input from Porsche on this issue? If yes, what was it? What causes this engine to be so different from my previous 2007 911 S that did not use any oil?I have visions of long term problems down the road. I hope I'm just paranoid.Thank you, Steve Peth

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