Oil is a wierd topic I know

But... It's been awhile. I use to run Amsoil Syn in the motor and their 90 gear in the Trans and Drive in my Jackal and Le Mans III. What do you all like and why? I will be sticking to the book on specs but am searching options and more importantly why you like what you like. Thanks, Tom
Ps I'm in the south of the US.

I also run Amsoil in my GRiSO. Well I run it in all my vehicles, including my old school Ural. Probably overkill, but I like the product, and it cheep insurance. We only have about a 4 to 5 month riding season here in my part of Canada, so it gets changed out sooner than required, because I like to put my bikes to bed for the winter with clean oil in them.