Date registered: Apr 2009
Vehicle: Current: 1987 560 SEC US, former factory trained MB tech 10 years, owner of 14 others.
Location: Spokane, WA.
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Well, it sounds like you are getting blow-by deposits from the crankcase on your throttle butterfly, causing it to stick, or not close completely. For a short-term solution, you could simply put some sort of in-line air filter from your valve cover vent hose. It sure sounds like you should use a heavier oil as well. I would use a 20-50 with those miles. It could sure it as well.