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      11-04-2012, 01:32 AM   #2
Ilma
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Canada
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Drives: 2008 135i
Join Date: Nov 2008
Location: Mississauga

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Sounds like your valve cover is leaking oil into the spark plug hole and fouling the plug as the oil works its way down the threads.

Having oil in the plug hole is the tell tale symptom.

You probably need a new valve cover gasket. You also may have inadvertently cracked the valve cover itself if you put any body weight on it while working on the engine.