Check this site out. www.bobistheoilguy.com Under the used oil analysis, you will see that the Toyota 4.7 V8 engine gets some of the best UOA of any car/truck (great engine). Looks like the best oils for our engine is Mobil 1 10w30, German Castrol 0w30 (hard to find) and Amsoil 0w30 (not API donut approved) but I would use the Amsoil when I'm no longer under warranty.