Bloody cars, wasn't life so much easier as a snotty kid on a pushbike? Anyway, I need S4 help again. I had what I thought was a rocker cover gasket leak and decided to strip it down and replace today. Now after successfully fitting I still have a leak....I know this cos its stinks and oil comes out from behind the engine.anyway, I took my good old HTC flashlight to the offending offside engine bank and noticed the oil is coming out of a circular style plug? Now I haven't bothered to search yet, so I'm hoping can save me the hassle and tell me A. What it is....and B. Is it easy to fix! So to recap, its a toothed circular style plug located at bank of engine, next to cam chain, just above where the gasket sits....anyone?