Blowing oil from the filler cap
My 2004 M3 had oil leaking around the filler cap. I know this can happen so I replaced the filler cap. Now I still have oil leaking around the filler cap. Quite a bit in fact. Like about a liter every 200 miles. That stuff is expensive and you don't look cool when your ride stinks of burning oil and has smoke coming up around the hood.
So, did I just get a bad cap, or is there some other malfunction that might force oil out around the cap gasket? I'm stumped.