What I use is Amsoil 20w50 in the engine. Full synthetic.
And SAFXO or whatever, a 75-90 in the rear end.
But the original recommendation, I don't know if it's still the recommendation, was 75-140 for the transmission, which is what I just put in.
The only one I could find was Valvoline synthetic. That's what I use in the transmission.
You can use what you want, I suppose, and probably have no problem with it.