I used to sell it, if that counts for anything. I used to use their two-stroke oil in some of my old Japanese bikes. It's pretty good stuff, although in a car/truck 1 year is a little much and for the price I'd just buy Mobil 1 Super Syn. I know the 10W30 Amsoil we used to sell was like $7.00 a quart. Amsoil did a bunch of tests a couple of years ago on some over-the-road trucks and didn't change any fluids for a full year...thats where they're getting that claim...for a passenger car I wouldn't try it.
