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Oil consumption on '07 3.8 C4S engine


Model: 997 C4S, Year:2007, Mileage:20500, Type of use:Street use only
My car uses a quart of oil every 450 miles or so. Black soot on left tail pipe, no smoke. Broken in buy the book and warmed up ( by oil temp not coolant)fully every time it is driven before going over 4 K RPM. Only use M1 0W-40. Is this oil consumption normal and if not what should I expect my dealer to do about it to properly diagnose the problem. Car is still under warranty.

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