how much overfilled ? a little bit wont matter, although lots will.
reminds me of a mate of mine, always high spirits, does stuff then maybe thinks about it afterwards. He changed the oil on his old vauxhall. Couldnt understand why it belched smoke and ran like an old tractor, sometimes the engine would run on after switching off. Had to stop by stalling it. He had forgotten to drain the old oil first ! There was 2 gallons in the sump, not one, it was dieseling on engine oil. Oddly enough it ran much better after draining some out. Oh how we still chuckle about that one.
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1994 850 2.0 bought at 32,000 miles used daily now 45,000. Still like a nearly-new car 
2004 filthy polluting diesel VW
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