i run the new stuff in my 06 sienna its what i used for refill after the 30K trans service. all new auto-trans seem to shift and down shift alot. apparently they are in a big hurry to get you into a higher gear as quickly as possible in order to lower the rpm's faster to meet epa pollution and mpg requirements, then they have to down shift at the slightest load increase. i thought our trans was messed up....just life as we know it now i guess. i noticed that a friend of mine's new tahoe does the same thing, probably a little less due to the bigger motor but still quite "shifty"