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      06-19-2009, 06:33 PM   #15
First Lieutenant
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Drives: 2008 M3 SSII 6M, '87 911
Join Date: Mar 2008
Location: Michigan

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I paid for my oil change at 7K miles. Contamination in the oil causes extra wear on the cylinder walls so loss of power would be an eventual consequence. I'm not an expert so I can't say by how much or how long it would take for the particulates to wear down the cylinder walls, if ever. I just feel better with clean oil. Cheap insurance is right if you're keeping it for 10 yrs. Low viscosity oil should sneak in to the combustion chamber and cause more oil burn, possibly fouled plugs and loss of power. This is a high compression engine so I don't like the sound of low viscosity oil as it can be pushed up to the chamber. Just change the oil yourself. Not a big deal.