As hot as an average air cooled engine is, a straight 30 would be the perfect oil to run in one. As I did in my old ‘64 Bug so many years ago, good old HD30.Free 2-day shipping on qualified orders over $35. Buy Super Tech Conventional HD 30 Motor Oil, 1 Gallon Bottle at Walmart.comwww.walmart.com
CF/SG is better than anything they had back then (35+ years ago). I’m sure it would be fine, and any conventional multigrade can have issues in hot weather in an air cooled engine, that’s why HD30 or ND30 was originally the recommended viscosity for OPE.I dunno that's two stroke diesel oil, I'd probably use a modern 15w40 in it over that.
You want us to believe that this statement is a serious question?
I am very well versed in the air-cooled Volkswagen world, and I have been for the last 29 years or so. You are correct that air-cooled VW engines do tend to seep oil and drip oil. With that said they don't seep more with syn oil, that is just totally false. I often run Amsoil Z Rod with no issues, now I am running Penn Grade oil, again no difference.I’m serious. They don’t have an oil filter it’s just a sump plate at the bottom and it leaks. They are known for it. They always say if it doesn’t leak it’s not a Volkswagen.