There are several bracket bolts on the front of the 240D engine. I had my 1982 in to the dealer to have the front seal replaced many moons ago and went to the pick the car up when notified it was done. They charged me to steam clean the engine and then a $2.00 bolt. Seems one of those bolts penetrates an oil passage and over time it gets loose and oil leaks out. Mine fell out and a lot of oil "leaked" out. Anyway, it was under $50, with most of it for the steam cleaning.

Check the bracket bolts - that they are all there and that they are all snugged up tight. Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)