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has for amsoil being the best, the biggest difference is the Viscosity index, which is the oils density in extremely cold and hot temps, Amsoils changes a very tiny % this meaning the oil does not wear out. its like taking your sweat pants and pulling on the waist band for 2 days solid, the waist will where out, due to the constant viscosity index, and amsoil being a lighter oil that the competitors, ( first oil to be 100% API approved.) it means you have a lighter oil protecting as much as much heavier oils, and sinces the viscosity index doesnt change but a few percent you have a oil the will protect long, last long, reduce "drag" on transferring compents, prolong life, and add power/