I finally took on the removal of the air filter housing and replaced the tiny O ring that seals the pipe going back under the housing to drain the oil out. I'd been losing around 1 quart per 500 miles... not too bad as I do have a lot of blow by, but now I'm actually dry!.... Easy fix except hard to find the part. Even the dealer had to order it!.

Thought I had many leaks.... turbo drain seals, etc. What a relief.

I also thoroughly cleaned out the housing and oil separator. I don't know what's inside, but it was really dirty. I used carb cleaner.

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Mr Goodfahrt (pronounced FAIRT... means "good trip" in German)

1982 300D Turbo Pastel Gray (off-white) 200k+(?)
newbie but willing