I am an ASE Master Certified Mechanic. I own a repair shop in Holland, MI. I stumbled on to Amsoil around 2012 when a Customer of mine introduced me to it.
He was a customer of mine that wanted to have fewer oil changes on his company vehicles. He was running 100k a year on his 2 trucks and Amsoil was perfect for him as we could change his oil every 25k vs 5k on most other synthetic oils. In 2018 he sold one truck which still ran great at 850k.
Since then I’ve used it on my own vehicles and countless other customer cars at my shop. I have seen great results and even some oil test that back up the extended drain intervals.
Feel free to contact me if you have any questions.