oil leak on Mercedes-Benz C-Class?

Oil leak on passenger side that seems to be up high, but i cant tell where the oil filter is, 

The leak is coming from the passenger valve cover gasket. Very common on MB. The oil filter is located on the driver side front of engine. Looks like a round plastic cap, black in color.The oil filter is usually up high on the mercs and on the left hand side near the back of engine its also worth checking oil cooler pipes also.

The problem is solved,after replacing valve cover gasket.The oil filter was just dirty.

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