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I'll add this. You guys with lifetime warranties better be changing your oil every 3,000 miles and have receits to back it up regardless of what type/brand oil you are running.
Alot of teams dont use anything they endorce eather. Amsoil Introduced the first API aproved synthetic motor oil in 1972, they also introduced theASL 25k mile oil in 1991 so its not just been the past few years. Here is info on motorcycle oils - http://www.notnormalmotorsports.com/...hite_paper.pdf