Hi all! i just bought my first e30 and indeed my first car. im in love with the cheeky 4 banger, and after getting it checked out at the local garage everything seemed great until today. i was looking over the car with my dad just to check for any missed errors and i noticed a pretty overwhelming shearing noise coming from the engine bay. Overwhelming once you hear it to start with otherwise it somewhat blends in with the idling of the car. Anyway i listened harder and noticed it was very high pitched so im assuming its coming from somewhere within the block, perhaps it might be a worn bearing? it sounds like metal on metal friction but as its high pitched im assuming its very quick. Otherwise im hearing the conventional tapping of the m42. Should i be worried about this noise? what could be the problem? any help would be greatly appreciated cheers!