My 1980 320 is blowing oil up through the primary air hose situated on top of the cylinder head and leading to the carb. It seems to happen at high revs, normally when I have accelerated to speeds of between 60 mph and upward - any ideas on solving this problem, I thought initially that it would be due to a rich mixture, but I have ruled this out.
David: thanks for your reply, did you have any luck contacting your friend - it's good to know I'm not the only one that has had this problem.