Had Amsoil 20/50 in all three holes and drivetrain operation was acceptable but I kept asking questions and reading. Installed Amsoil Severe Gear 75/90 in the trans and Amsoil V-TWIN synthetic in the primary. Night and day difference. Everything is quieter and smoother. Finding neutral is almost effortless and the clutch just feels better and more precise. It is almost like it inhales itself into the next gear. Hope this helps anyone trying to iron out any drivetrain quirks. BTW, I have no affiliation with Amsoil whatsoever.