M1 oils are not grp 3. M1s base stock is a blend of PAO, esters, and other base stocks. Amsoil is not 100% PAO, and has other base stocks as well, for a better performance oil. Proprietary yo know.
Originally Posted By: Bjornviken
And Mobil 1 is overpriced for group 3 but still a good oil. Does not matter where they get the base stock from, its the blending process that is important. Where do you think exxonmobil get there GTL base stocks from?