An engine Oil leak may develop from the PCV vent housing on the valve cover and/or the inspection plate on the front of the engine.Google+
Car Problem Reports
Mercedes-Benz CLS500 Oil May Leak From PCV Vent Housings and Inspection Plates
Mercedes-Benz CLS500 Problem
Model Year Affected: 2006
Average Mileage: 52,000 mi (48,000 mi - 60,000 mi)
Visitor, 2006 Mercedes-Benz CLS500
My engine oil started leaking from the driver side...plus it makes my car too slow to pick up gas....im so dissappointed with mercedes cars...:( ....most of mechanics cant find the problems with my car....
oil leak near PS res drivers side
Oil leaking from inspection plates on the front of engine. A technician indicated that it may be a rear main seal oil leak, which seems premature for a car with only 48,000 miles. My engine light is now on, hence I will call the dealership.