justin_o_guy2 wrote on 07/26/17 at 11:47:46:Friction modifier will screw up the clutch.
Rotella 15-40 is safe and a good oil.
I just did a bit of research - Now I know about friction modifiers, thanks!
I bough Yamalube, which doesn't have any. But I'll know now to look out for that in the future.