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Old 01-06-2020, 11:40 PM   #11
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Join Date: Jun 2010
Location: beverly hills, ca
Posts: 28
My Ride: 2002 M3, 2000 323i
There also might be dried burnt oil in there. I've had the valve cover seals weep oil into the spark plug tubes and make plug threads grimy/sticky to get out. I was able to get them out on a cold engine. There was resistance the whole way out but they came out.
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