List?
Is there a reference list of the manufacturers that are recommending 10w30 in bikes? Aprilia says 5w40, as does Kawasaki, and Suzuki off road. Honda is still recommending 10w40. Seems like a really small market, and even if recommended, I bet most folks would opt for a 10w40 or 20w50 if an option is listed in the owners manual. Regardless, fresh oil, changed regularly is the key to long engine life, especially in engines that share the oil with the gearbox.
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