When I was a teen and I raced 3wheelers I was sponsored by Neo synthetic oil. It was to be used @ 100:1. I could not keep my engine together @ that ratio.
I went back to golden spectro @ 40:1 and never had another problem.
He's another first hand testimonial of a failed oil mix, thanks to Chris142. Now we have two failures at insane 100:1 oil mixes.
Why is it the oil makers (Interlube and Amsoil) claim 100:1 and not the engine manufacturers?
i suspect that a 100:1 ratio would work with a high quality oil and perfect jetting. Keep in mind that temperature,humidity etc have a slight effect on jetting. Most of us do not have the necessary equipment to adjust jetting every day or more than once a day. We also do not want to be bothered with it.
So we choose a safer mix ratio of 32:1,40:1 or 50:1 all of which give good engine life without the need for chasing jetting.