I think maybe you are not giving enough consideration to the business side of this buster. Your take is M1 is better, period. It could well be. But to think XOM wouldn't make something for someone to protect M1....I don't know. I'm pretty sure XOM's "flagship" is $!
Who said Toyota knows more? Maybe XOM came up with the formulation and peddled it to Toyota.
Who said Toyota knows more? Maybe XOM came up with the formulation and peddled it to Toyota.