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This was a major debate back when the formula requirements set by the govt reduced ZDDP in motor oil circa 2003-05.
Many folks with air cooled motors said they had leaking only after the switch to synthetic. The consensus was to a good quality oil with the proper amount of ZDDP. Also, avoid additives which can throw off the balance of the package in the oil.
I used Brad Penn 20W50 for years but can get Schaeffer 7000 plus 20W50 locally which is 10% synthetic. It is formulated for flat tappet cam motors. Either one is great IMO.
More more thought: there are different types of synthetic. Some are purer than others. Do the research. There is a TON of info in the tech forum.
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Joe
See Porsche run. Run, Porsche, Run: `87 911 Carrera
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