Can't comment on your problem, but
A common source for leaks (as was in mine) is the hard cooler lines where they have clips that secure them to the motor oil pan. There is a little bushing that wears out, then the line rubs on the metal clip and eventually develops a leak. I sourced some from the junkyard and cleaned them really well and somehow got them in there.(they are a pain to fish through.)
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----Adam
1985 300SD 322,000
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