Pardon me if I sound skeptical but this quote:
"4.To ensure every lubricant meets Amsoil standards, it is tested in the Amsoil lab from blending through bottling. This guarantees every gallon of a specific product is the same as the one before it. Amsoil cannot afford to have even one quart of oil leave the company as substandard. No lubricant manufacture tests their products as thoroughly as Amsoil!"
....complete with exclamation point, sounds like it's straight out of a marketing blurb for a product line.
Look...this brand may be a-ok. What I do know is it's expensive, and I can show you a Audi sitting with failed turbos that used it. And again, I admit, the turbo failures may or may not be related to the brand of oil that was run in it.
I believe I'll stick with what I've been using. The brand I've been using is good enough to be factory fill for several high performance car lines from some well respected car companies.
Good enough for me.