You are going to need a new valve cover gasket and a set of aluminum bolts. This is an 06 E90 330i thing and the bolts cannot be reused. Does anyone know if the X5 ever used the metal valve cover w/aluminum bolts? When I did my 330i, 2 or 3 of the old aluminum bolts were already broken off. I had to drill and tap out the threads. Change your spark plugs while everything is apart.

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2009 35d, 2006 325i & 330i