You make a perfect educated point.
But it seems you drive a hell of a lot, and most of it likely highway miles (right? 200 miles of city... I don't think so), so obviously, there is lowered stress as to constant stop and go, and short rides.
Performance wise, I don't know pure numbers, but because oil companies are so secretive about their formulation makes it difficult to determine what group oils are a part of. I don't know if AMSOIL is group 4 or 5 (my guess is a little of both with a PAO base stock versus pure polyol ester stock).
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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