On the M112 there is a oil inspection port on the front of the timing chain cover. It's rectangular (about 1" x 2") with a round plug located just below the oil filter. It's a common source of oil leaks and the fix is to replace the rectangular gasket/seal. I assume your engine would have something similar as the M112 and M113 are similar design.

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Good luck.






1998 E320 Wagon