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How to Fix Oil Leaks from the Engine Cover

Model: Mercedes Classe M W163 - Years 1997-2005
Part: Engine

You may experience oil leaks, which could be caused by an issue with the engine valve cover. There are screws that hold the cover to the engine head, usually four screws. The engine (and its cover) are subject to significant temperature variations, which can deform the rocker cover, and the insufficient number of screws cannot contain this deformation. This design choice results in significant stress between the cover and the seal, which over time leads to a loss of sealing and consequently oil seepage. One solution could be to tighten the screws to increase the pressure exerted by the seal.

Updated on 21 February 2026 by ScegliAuto

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