Just to add my $.02 to the discussion on the use of synthetic oils in air-cooled engines, I recall reading a tech note from Gene Berg that recommended not using using it. As I recall his data determined that the synthetic oil rejected more heat than regular oil and therefore did not transport as much heat from the moving parts(crank/crankbearings, etc.) to the oil cooler. His bottom line was that the engine tended to run hotter with synthetics. Just another data point. Charles Armstrong '70 Bus
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