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Oil leak over spark plug?

MichaelB
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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I have a '99 Legacy with 75K miles on a 2.2 liter engine. Changing the spark plugs today, the front-passenger plug wire was covered in oil. What could have caused this?

Sounds like a leak from the valve cover gasket. There is an o-ring shaped gasket that seals the valve cover around the spark plug well. If it leaks, you will get oil around the plug and on the wire. Not uncommon.

 

Commuter

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