For all who helped me with my questions about oil coming out of breather:
(was an old post sometimes slightly of topic so I made this new one)
I can say that I tink the cause is found!
No piston, no pistonrings, no type of oil, no oil filter, no breather valve but a wornout oilpump. I couldn`t see it right away but compared to an NOS pump (special thanks to FTR in Holland) you could see that the gear "dents" were thinner. After putting in the new pump and a test drive there is barrely oil coming out of the breather!
The oilpump is the best lubricated part of the engine but after more than 70 years and the Lord knows how many miles it was over and out.

email (option): mail@clemensvandusseldorp.nl

I doubt that would be your problem?