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Changed spark plugs on a 2004 mazda found oil in the pistons #4#3#2#1 was no oil in it

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You didn't find oil in the pistons, you found oil in the spark plug tubes. This is fairly common on older engines. Over time the seals in the valve cover begin to leak around the spark plug tubes. Oil then works it's way into the tube and settles in the bottom.

There is an easy fix. Simply replace the valve cover gasket.

Posted on Nov 08, 2014

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