Join Date: Dec 2018
Vehicle: 2010 C300 4Matic
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Oil leak on 2010 C300, not the usual suspects
i just bought my wife this 2010 C300, and it runs great... but the previous owner decided to remedy the oil leak concealing its presence, so it's my problem now.
we are experiencing the tell-tale oil dripping onto the exhaust, on the RH (passenger) side of the engine. i pulled the engine cover, and it's definitely on the side, not the rear. the cam plugs and breather cap are holding tight for now... at first i suspected the valve cover gasket, but after clearing everything off, it looks like the oil is coming out of the bolts that secure the valve cover. is that a thing? the oil seems concentrated at the bolts directly beneath the wiring harness just a few inches south of the oil fill cap. the oil is seeping down the valve cover onto the exhaust, but also over the other side toward the intake manifold. my assumption is that the valve cover gasket (if it was leaking) wouldn't defy gravity by traveling up and coming down the other side... i've attached some photos.
i welcome your thoughts!