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10w40 is fine, that's what was spec'd for the Hondas with CG250 engines and is still fine now. In fact, new Hondas spec 10w30 and a lot of new cars with turbos and direct injection spec 0w20. I run 10w40 in my 1700cc Nomad. Save your 20w50 for your Harley or to grease an old wagon wheel.
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