No easy answer
I believe that air cooled engines should use oil that is manufactured for that application. I use 30W air cooled engine oil from name brand manufacturers and add ZDDP additive. More importantly, the unleaded E10 gasoline we are using in our cubs probably does more damage than any "regular" oil might. There seems to be no shelf life to today's gasoline and very little lubricating and cushining properties to the fuel.
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