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I just had a fluid change done at 96000 miles at the dealer for $250 and I haven't heard the whine since. It would whine only on hot days, and my Suzuki SX4 had the same whine when it got real hot.
CVT whine
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Adding my experience — 2015 iQ with 61kkm, made a whine upon heavy acceleration when the engine was warm, at any speed but especially when on the highway. The noise was high-pitched, like a power drill, and seemed to come from the back of the vehicle (or maybe just the exhaust). The guy at the Toyota dealer said there was no way CVT fluid replacement would make it go away, but I said to go ahead with it anyway. Just got it back, drove it on the highway for a while, floored it the same way I did while diagnosing the issue. The whine is completely gone. Funny how even though the fluid is supposed to last the life of the transmission, it still seems to go bad before then 
i really doubt that the fluid was the cause of the whine unless the fluid was low or some other issues. 61k KM is relatively low for the fluid.
Adding my experience — 2015 iQ with 61kkm, made a whine upon heavy acceleration when the engine was warm, at any speed but especially when on the highway. The noise was high-pitched, like a power drill, and seemed to come from the back of the vehicle (or maybe just the exhaust). The guy at the Toyota dealer said there was no way CVT fluid replacement would make it go away, but I said to go ahead with it anyway. Just got it back, drove it on the highway for a while, floored it the same way I did while diagnosing the issue. The whine is completely gone. Funny how even though the fluid is supposed to last the life of the transmission, it still seems to go bad before then
When I bought my iQ with 85,000 miles on it, the transmission whined all the time. I eventually removed the old fluid with a vacuum setup and replaced it with new. The whining stopped. Your mileage may vary.
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.
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.
very interesting.... I am curious if that whine is an indication of potential transmission problem? Were there any other abnormalities along with the whine?
When I bought my iQ with 85,000 miles on it, the transmission whined all the time. I eventually removed the old fluid with a vacuum setup and replaced it with new. The whining stopped. Your mileage may vary.
No other issues with the transmission.
Did you get these in yet? (Hopefully)…Just ordered 2 filters and it should arrive in about 21 days.
Yes, I got them in about a week ago.
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