Hi Michael
I have a 65 230 SL that does the same thing. Oil is thrown up through the dip stick tube especially at high revs. It makes a mess over the engine, especially the fuel injection pump. Cleaning the engine breather pipe will help if it's blocked but the problem is more likely due to engine wear. My car has done 132,000 miles and goes like a rocket so on the advice of my mechanic I just live with it. Look on the bright side: all that oil on the underbody must be keeping rust at bay!
Regards
Mark
1965 230 SL light blue, auto, RHD