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Worn Valve Stem Oil Seals?


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I'm finding that the spark plug closest to the battery is covered in oil after a few thousand miles and needs cleaning. Is the most likely cause valve stem oil seals? The compression test was good so presumably that rules out oil leaking from the head gasket into the cylinder.

Those are the only two ways I can think that oil is getting into the cylinder and onto the spark plug.

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Just had a look at that spark plug again after 300 miles. The whole end including tip is completly black and covered in oil. Also there is oil sitting ontop of the spark plug whilst it is screwed into the engine.

If it is a head gasket oil leak into the cylinder why would there be oil outside of the engine on at the lead end of the spark plug?

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