A year or 18 months ago, there was a post on a similar leak. It was either here or on the mercedes-veterans site. The source was the indent where the water pump housing fits into the block. Apparently there is a thin spot over an oil passage there. It was really strange. I am not making this up.

I will schlep around and see what I can find.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe