I opened the air cleaner box on the 84 300Sd to track down oil all over the top of the strut mount, the box is directly over the mount. There is a drain hole in the box, its seems that is where the obvious oil is coming from.

There is quite a bit more oil than usual in the box. What might be the usual suspects for that?

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1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI