I am skeptical as well. I try to look at it from a logical point of view of the system and I don't see how it could make a measurable difference.I'm somewhat sceptical about this. I can see how there might be a difference, if the new oil generates less friction, thus allowing parts to move a little more freely, but, well, not convinced. If it really was that big of a change then we'd see everyone doing it. Having said that, if it's back to back runs on the dyno on the same day, and short time period and same conditions (time of day, temp, stuff like that) then it's very interesting.