Replace the oil cooler If you look up oil in water in WIS they say to replace it. I had the same problem and two head gaskets and a lot of $$$$ later i replaced the oil cooler and problem fixed.

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600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis.

i don't believe in the lord! He's never bought me a Mercedes Benz.