Bassmaster, I agree. It's likely the oil leak is coming from the joint between the timing chain upper and lower covers. There is a U-shaped gasket between the two covers that goes in dry with a dab of MB black sealant at each end. The key to a successful replacement of this gasket is getting the recess perfectly clean and adding a small dab of sealant at each end.

Step-by-step instructions for this repair are available in the "DIY Links by Parts Category" under "Engine Mechanical". Scroll down until you find "Timing Chain Cover Seal Replacement".

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Fred Hoelzle