ok.. so the honda oil gp4 sucks,,, what brand and type can i buy off the shelf ....
thanks
rotella 5w40 is a group III oil which is classified by law as a syn and actually has specs similar to the group IV/V mixtures on the market. any 15w40. I have mobil delvac 15w40 in the bike right now. Chevon Delo 15w40 has more moly than the others, but the level is still low enough to not affect the clutch.
I also use AMSOIL 10w40, the one for cars as it has always been rated for cycles, started using it in the mid '80s. Now they sell more $$$ cycle specific oil, a little bit better specs but much more $$$.
my next change I will be using Amsoil 10w30/30HD diesel oil.
and of course MOBIL 1 is used by a lot of people.