I've had an oil leak in my 2002 525i sport (@151,000 miles) that I THOUGHT was fixed...in beginning of February, I had the following items replaced: - valve cover gaskets and bolt seals - oil filter stand gasket and seal kit - vanos oil line and seal rings However the gosh-darned thing is still leaking!! I can't say how much for sure but I know for certain that I get the "CHECK ENGINE OIL LEVEL" message far sooner than I should expect and I have to put in a quart or more. Can anyone out there help a brotha out?? What else should be done here? I hear a lot about a CCV valve...what is that and does it have anything to do with this issue? I appreciate all input...thanks!