Got this the other day,,,,E90 came in with check engine light on,,,,I could tell some kind of backyard mechanic has been working on this car and trying to fix the problem,,,,but they made the problem worse. The faults were lean mixture and airmass meter faults,,,,so I decided to smoke test the engine and found major leaks around the valve tropic motor and oil everywhere,,,,I removed the valvetronic motor and found it silconed in place with the whole gasket in 2 pieces and siliconed trying to seal it up with silicone,,,,,all they had to do is buy a new gasket and no more air leaks.