I love this thread (every time!). You can't beat Amsoil, however there are several very good brands on the market today for us. Most of your high end oils are good. Synthetics are hands down better than conventional oils. Stay away from paraffin based oils.
I've run Amsoil in everything (trucks, boat, bikes, car, lawnmower) for the last 6 years, including a powered up Cummins Ram. Oil analysis always showed contamination (carbon from the forced overfueling and big turbo) to necessitate an oil change, not the oils properties.
Any of the high end synthetics will do you a good job Amsoil, Lucas, Mobile, BelRay (if you can find it), Castrol, etc. (My personal advice is to stay away from Royal Purple). Yes, I'm an Amsoil dealer, but only because I like the discount for my personal use.
