I've seen many different tests over the the last 20-30 years and Amsoil usually comes out on top and if not, it's second. No other oil ever tests that well across a battery of tests.
It's why when someone asks what's the best oil for xxxx, I have no hesitation saying Amsoil.
I have used Amsoil for 20-30 years in everything, 2-stroke oil (Actually passed the tests at 200:1 or 300:1 ratio but the engineers decided no one would believe them so they just called it 100:1), Diesel and Gasoline fuel treatments, greases and obviously oils and filters for Jeeps, cars, Diesel pickups, multiple ATV's, Zero Turn mowers, Push mower, Pressure Washer, Edger.