My book does state some weight / weather recommendations.. but I asked the guys at my local NAPA - everyone there that rides all year said 10W-40.. So that's what I'm sticking with; non-synthetic. . .
There's no one ultimate, the one, super uber duper awesome, does it all - oil.. I would suggest something non-synthetic for the wet clutch as was suggested to me. Also additive free..
Good luck!
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