Which type auto tranny fluid for Toyota Yaris?

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I'm guessing, like for other Toyotas, it calls for T-IV, but I want to be sure. My daughter just bought a used one and I'd like to change the fluid...unfortunately, the car didn't come with the owner's manual...
 
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They all take ATF-WS. It's about $11/qt from the dealer. Don't use that aftermarket multi-vehicle junk, stay with the approved OE fluid. On the last one I did, I flushed it with 12 qt of ATF-WS. The fluid turns purple fairly quickly, so don't be too concerned. A flush every 90k or so is all that you really need.
 
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Probably depends on the year. For T-IV I've used Mobil 1, Castrol IMV, Maxlife. All met JASO A1 spec. If it takes WS than I'd lean towards MaxLife. Like WS is is on the thin end of the spectrum. Not sure what people think is so special about these fluids?
 
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