15w40 is too thick. Valvoline what? They make a number of different oils. Stick with a high quality synthetic oil. DT40 is a good example of a highly recommended oil for the M96. I'd get the questionable oil out of your car and find someone that knows something about your car to do work on it.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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