I have a 2015 CanAm Outlander L 450 purchased new in 2016 with 5 year warranty. OEM oil is available as 0w40 full syn or 5w40 blend and both are pricey. Thus far I have used the 5w40 blend which has no API donut but "meets" SM. 2015 manual says to use 5w40 SG, SH, or SJ oil if OEM oil is unavailable. I think the 2019 manual states SM.
1. Do these ATVs use a wet clutch? I think they probably don't if OEM oil is SM rated.
2. What alternative oils are you all using? I'm thinking of using Castrol Edge black bottle 5w40 or Mobil Delvac 1 5w40 since these are API SN and are the specd weight. (I think Rotella T6 opted out of the SN rating to keep high Zn/P)