s2s-
This subforum is for gasoline mercedes, but there is another subforum for the diesels. I would suggest you post your question again in the diesel subforum and you are more likely to get suggestions. Good luck. I unfortunately, don't know the answer to your questions.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).