Amsoil is good stuff, pretty much across their portfolio. I’ve bought it, used it, and recommend it for where it’s going to succeed and have benefits over shelf stock. But let’s be real, it’s not super hard to: 1. Formulate an oil to excel at certain tests when shelf price is not a constraint; and 2. I’m pretty sure there’s at least one (possibly more?) small-volume blenders that
would has shown better results on certain tests.
But, let’s be real again: every finished oil is a balancing act of attributes and compromises, so in a given application there may be some nearly identical contestants, but if you change one or two of the variables the final tally may change re: superiority (no pun on their HQ location

).
Any time we get drawn into these comparisons, you have to put yourself on the receiving end of supply and demand: “Price, quality, delivery: pick two.” Meaning, if you want high quality and cheap price, the delivery times are gonna suck. If you want quality and delivery, the price will be dear. But you’re free to choose whatever combination of two variables you want. Then, the third variable (most generally, it’s ALWAYS price) falls where it may, and you pick which fits your budget. Amsoil tries to strike a good enough compromise on all 3 that regardless which 2 are your priorities, they’re in the running for your business if you’ve got an open mind.