My C180 W203 built late 2000 has a slight oil leak from the front crankshaft oils seal. Is there anyone who has replaced this seal? How did you do it? I opened up the area, removed the air filter and housing and belt and washed it down thoroughly, put it back together and drove the car for about 10 km with protector plate under engine removed. oil was visible from behind the pulley and on sump front bolts etc.