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I agree with 2 wheeler.
Straight 40wt full synthetic, Royal Purple.
One advantage with full synthetic (if you see this as an advantage) is IF there are any marginal gaskets/seals on your engine, it will leak.
So like the old wive's tale... It is best to use full synthetics from new in any sort of engine. Switching from Dino oil to a synthetic will almost always begin to show leaks after the Synth has had a chance to loosen the sludge deposits that were in effect, sealing your cases.
I live in Florida so 40wt is a better choice for air cooled engines. If I was in colder climates I would switch to a 30wt in colder months.
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