Just changed to Trop-Artic 10W-40 in my Suzuki Volusia 800. This oil is about the smoothest shifting oil I have used short of Amsoil. Previously had Supertech 15W-40 for about 2k and it was clunky shift and many false neutrals with that oil. The Trop-Artic is listed as both SM and SJ spec on the back with the SJ being what is recommend in the owners manual.