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      01-17-2013, 11:56 AM   #2
Blackhawk36
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Drives: 2007 335i 6MT No iDrive
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Most likely cause is the valve cover gasket is leaking or the valve cover itself is cracked. Both are common problems. You could also have a leaking oil filter housing seal. I have seen the valve cover gasket replacement at a dealer costing around $850 and from indy shops it is usually around $650. If the valve cover is cracked add at least $400 to the bill.