I run Amsoil all around, except in my Scarab (for now). My TrailBlazer gets 0W-30 oil and an Amsoil filter along with Severe Gear 75W-90 gear oil for the front and rear diffs. Had the Synthetic ATF too, but had to have some trans work done so its mostly regular ATF now.
My Epic 22 got some Amsoil 5W-30 at the end of summer 05, didnt change the oil last year (I know, I know. I didnt have any Amsoil at home and by the time I figured it out it was too late to order it) so she will be getting some 0W-30 and probably the remaining synethetic ATF for the trans. That along with the oil pressure sender are the first things Im going to do when she comes out of storage.