Q: Q: I have oil leaking onto my spark plugs.

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So if you inspected the car that has oil in the spark plugs, would you be able to determine whether it was a valve cover gasket replacement repair or piston ring repair? And what is the cost to do each? I don't want to get the valve cover gasket fixed justvto find out it's really the piston rings that are bad.

My car has 158000 miles.
My car has an automatic transmission.

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