Originally Posted by SuomiX

I have a same kind noise on my m62, and only when the engine is warm. Both VANOS units has swapped about 2 years ago with the tensioners and the guides. Some days it's a little louder and the other days a little bit quieter. Could the vanos solenoids produce this kind sound? And if the solenoid fails, should it throw error codes? Is it possible that the oil flow is disturbed without any VANOS related error codes? I found video on Youtube with a comment that one should check the valve cover gaskets. Why, how those gaskets could trigger that sound?