Wardtribe,
I may have missed it but what year is your W210 E300? Turbo ('98-'99) or non-turbo ('96-'97) ?
Mine is a 1999 and the oil cooler is air cooled so no chance for antifreeze coolant to mix w/ oil there.
Thanks,
Ken

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2014 E250 Bluetec 4-Matic
2014 GL350 Bluetec 4-Matic
1996 Chevy Tahoe 4 x 4
2009 ML350 (sold)
2005 SLK350 (sold)
1999 E300 Turbodiesel (sold)
1998 ML320 (sold)
1991 300D 2.5 Turbodiesel (sold)