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Old 01-24-2011, 08:20 AM   #56
My Wifes 330i
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Join Date: Oct 2010
Location: Moncton, NB Canada
Posts: 26
My Ride: White 330i, Outback
Valve Cover Gasket (VCG) could be your problem

When I did the OS I completely removed the dipstick and when I reassembled I replaced the O ring. That was the most difficult of the entire job. Ended up slipping o ring onto bottom of tube and as I inserted I would stop take a small allen key and tuck the o ring in. Go a little further and tuck some more. Finally I seated it by wiggling while applying downward pressure. I then did oil change just to be on the safe side. Just in case dirt went down the hole. While draining I noticed a lot of oil on the exhaust manifold and running down. Upon closer inspection I see I blew out the VCG at the back left corner. So I replaced the VCG. Now if you only changed the OS as preventive maintenance and not failure, as in my case I had oil coming out the dipstick tube, then I don't know what it would be.
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