I have been experiencing an oil leak from the front of the engine of my '98 E320. I think I have identified the culprit as the oil pressure port plug/cover (also refered to as a "timing case expansion cover", anyway, see the attached picture if you are still wondering what I am talking about. Replacing the gasket seems like an easy enough thing to do, my question is: what has caused this leak? Should I be checking for a malfunctioning PCV (ie., did a pressure buildup in the crank case cause this gasket to fail)? Any thoughts on root cause, or is this just one of those things that eventually happens?
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