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It has been said that the thermal properties of synthetic are different from conventional. That is to say that synth retains heat more than conventional. As far as I know aircooled motorcycles and vws that use synth are race vehicles and are looking for the extra hp not longevity of the engine. I have not personally tested the claims, and have not saved the links, but I am sure you can find them. Persoanlly I use a blend and have not had any issues for a year now in a stock engine with 35k miles. If anything it leaks more than with full conventional and has a little less oil pressure at idle.
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