I was doing an oil change this evening, everything went fine up until I tried to re-install the drain bolt. It just wont tighten!! I have the torque rench set correctly but the bolt just doesnt tighten up. Upon inspection of the bolt there doesnt seem to be a whole lot of thread on it, just a bit towards the head where the new washer is. If I take the washer off the bolt will tighten but I dont want to tighten it up too much just incase I damage something. Anyone ever come accoss this? Does anyone know if the bolt is supposed to be threaded all the way or just a bit?