Mark and Rodd,
Thanks for the help. I've cleaned out the breather hose and according to the thread to which Rodd referred me, I have the correct dipstick. I'm replacing a couple brake hoses, and then I can take it out and see what happens.
Mark, I read in another thread that you also had oil coming out where the tach cable goes into the block. It seems my car is having very similar symptoms, especially at high RPMs. Did you solve this issue with a new tach seal?
Dan H
1965 230 SL Euro 4 speed (me)
2004 230 SLK Kompressor (my wife)