I still have the box for the oil filter from last service. Says SMF 103 on it. Bonnie uses same filter as our bikes. As far as oild goes, I was using the Amsoil 10w-40 in the wintertime, and 20w-50 in the summertime. I didn't notice a bit of difference in the clutch or shifting gears. I don't think you can go wrong with either one.
