I worked on and off at a parts store the owner was an Amsoil guru. I have run a bunch of their stuff in all matter of quipment. No issues unless you count wiping out rear main seals on everything over 20k miles. I remember when the catalog was a few pages. Now they have a different product for every conceivable application. Out of laziness, I pioneered the once’t a year oil change. Every year on my birthday ez peezee. Also noticed the moar amsoil I had, tranny, diff, transfer etc. the more likely my vehicle was to get totaled in a wreck through no fault of my own. I ran Dominator in a few oil injected sleds. They also make a water proof grease that was very dependable for me.