the rotella t6 0w40 has no jaso ratings. the t6 5w40 is more than fine and has been used for years and discussed on tons of atv forums. it has the highest jaso rating. MA2.Rotella T4 15W-40 for warmer and Rotella T6 5W-40 for cold weather use. Also, you could probably use Rotella T6 0W-40 if in severe cold.
All will cary the JASO ratings for wet clutches as your manual is calling for those.