Mine has a new aluminum valve cover and seal.
I see two flaws in the design. One, the "bolts", bottom out if you tighten them too much. Second, the seal is not wide enough. The gasket goes mostly into the cover grove.
My secret to sealing leaks is adding an extra layer. For the sparkplug holes, only the extra liquid seal is applied thinly on the oil "cover inside". RTV for half moons and VANOS mating surface. A thin layer on the head sealing surface. I've done several different manufacturer valve covers. None have come back for leaks. I'm hoping the X5 will do the same. I have two other seals to use if necessary years from now. Fel-Pro and a FCP one.
The OFG has been holding up for two years now.
