I re read your original post. I know amsoil can be a premium sometimes, but if you find a greatocsl dealer, they sometimes don't charge for shipping. Also, I've been running over 22 lbs of boost all summer on 94 octane and not a hiccup. Oil is clean, temps are good. I should clarify, peak boost is over 22. About 17 lbs steady wot. Starts are smooth. Idle is smooth. I'm sure you know most of this already. High quality oils are very similar when compared on a molecular level, but for me, it's amsoil every time.
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