. Newbie here. I've been looking round for a good site like this for a while . Just bought a 318i se. Petrol saloon 1998. Old car but MINT. Just 1 shall issue I hope someone can shed a little light on. Engine sounds nice and quiet. Except a grating sound that come from just behind the dipstick! Now if I take dipstick out it stops. Put it back in and it starts again. If I slightly loosen oil filler cap it goes . Tighten it back up it comes back. Any ideas fellas. . Thanks in advance.