I usually see noise complaints on higher mi/km vehicles. I am also on a Prius forum and recommendation to change the fluid is quite early due to contamination/wear/fluid breakdown, even with no noise, no vehicle breakdown.
I guess a similar concern has arose regarding the iQ, and similarly here I am interested in looking at alternative CVT fluids, like Redline Non-Slip CVT fluid for example. (I just looked up Amsoil and they also have a CVT fluid). (Looks like Redline is a “better” formulation with a lower pour point temperature)?
Anyone consider trying/try something else than Toyota brand? I would definitely when the time comes for mine.