One problem related to engine head gasket leaking has been reported for the 2008 BMW 3 Series. The most recently reported issues are listed below.
I was informed the valve cover gasket and oil filter housing gasket were leaking, which caused a problem with the eccentric shaft sensor. I paid for a new valvetronic motor, eccentric shaft sensor, valve cover and gaskets, and oil filter housing gasket, and the associated repair. Fast forward 3 months, I go in for a oil change and am told that again I have a significant leak from the valve cover gasket and oil filter housing gasket.