Maxwell,

If the separator is clogged with something then cleaning it will definitely help. The unit gravity drains back to the oil pan so if the drain line is not draining fast enough the oil will go somewhere. On the other hand, the oil separator may be overworked by the blow by - higher volumes of blow by make the velocity of the gasses more capable of carrying oil droplets further - which would suggest the issue is internal engine wear allowing more blow by.

It cannot hurt to clean the separator out and see what happens. If that does not work, you will have to look deeper inside the engine. Good luck, Jim

__________________
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)