Docking pilot, when was that letter written and when was all of this testing done? I really don't care that much but when a guy who builds race motors for one of the most successful race teams in NASCAR says that redline is better and that all of the teams are using it, I sort of believe him over some scientist in a lab. Also he has nothing to gain by telling me this so it isn't some sort of sales pitch. Like my first post said though, just change the stuff and it doesn't matter what you use. I am sure that amsoil is good, but I will stick with redline.