I'm an Amsoil guy & getting ready to do an oil change. Amsoil has a product i've never seen before, Amsoil 20/50 Oil, Primary & Tranny Fluid. Has anybody used this in there primary & tranny. Please let me know, as i'm a little skeptical, but, Amsoil has never done me wrong. It's a little price ( $8.80/quart ) but if it covers all three areas, it will save me in the long run.