I'm not sure to even understand your point.
Correct me if i'm wrong, youre saying that you always used 10w30 and it worked pretty well so far?
I belive you. My point is that there is a specific oil for that purpose, made by experts in tribology.
I would probably never see the difference between the bell ray 80w vs 10w30, for what i'm doing with my Shee.
But i am 100% sure, that in a racing environement, where everything pushed to their limits, the specific oil will do better.
So since i will not take the time to make a deep analysis, i will simply trust Bel Ray's tribologists.