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      10-19-2011, 10:19 PM   #7
Brian_TII
Second Lieutenant
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Drives: 06 e90 330i 6spd
Join Date: Aug 2010
Location: Atlanta, GA

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I can almost promise you it's broken valve cover bolts letting the valve cover leak onto the exhaust manifold. It's probably the most common problem with these cars. Some people recommend replacing the gasket and installing new bolts. Dealer will want close to 1000 bux to do it. I (and others) have had success replacing just the broken bolts. It took me a little over an hour and $40 for a complete set of new bolts though I only replaced the broken ones. Problem has been solved for over a year now...