Can some one guide me as to where my oil leak is please, on 2001 ml270. At the moment the oil is hardly hitting the drive so must be slow leak, I have taken the engine cover off and the leak is where the blue line is, see piccy. I can't see where it's coming from, but seems high up, maybe just below the 4 black plastic bits going into the engine(injector?) there is a dribble on the alternator, yet a tiny pool to the rear of the engine on a ledge. Also the car has been driven for a couple of months overfilled with oil, now drained off to correct level. Any guidance appreciated, thanks for reading.