It's time to think about changing the gear oil. There was no normal topic on our site, which is a pity. I had to smoke the internet. A lot of conflicting information was found on the Internet, not only which original to pour, but the timing of the oil change (there is only 20 bodywork). Some say that it is necessary to change after 80t.k.p. Others that 60t.k.p. the third that after 40t.k.p. And in one place, a person recommended an oil change after 160k.p. Someone from DRIVE2 wrote that he uses Toyota ATF WS, Toyota ATF T-IV, Toyota ATF-DIII automatic transmission fluids. But elsewhere they claim that all these fluids are not compatible. Those. cannot interfere. Complete replacement only.
In our expensive time, oils have risen in price, and besides, in our city there was no original, now I’m thinking about changing the original oil to an analogue. In addition, when replacing from the original oil to an analogue, they write that it is necessary to flush the box. (i.e. complete replacement with flushing).
And so I became aware.


Toyota ATF WS complies with JWS 3324 with part number 0888602305.
1) Viscosity at 40C = 23.67 - this transmission is really very economical, in conditions when the box is not yet warmed up. A lower viscosity oil resists gearbox parts less and saves fuel.
2) Viscosity at 100C = 5.36 - we see the same lower viscosity at operating temperature - when the box is already warmed up.
3) Pour point -44C - this is not a record, of course, but it is quite normal for Russian winters.
4) Brookfield dynamic viscosity at -40С = 9070 is an excellent result, this parameter is much more important than the pour point.
5) Corrosion on copper at 150C = rating 2a - normal, 1b - considered excellent, 2a is close ...
6) Sulfur content = 0.060 - low sulfur content. That is, in principle, there is nothing to oxidize.
7) The package of additives is standard - a little phosphorus, which is part of the anti-wear additive. A little calcium - which acts as a detergent neutralizing additive. A little boron is an Extreme Pressure antiwear additive, or a dispersant.
8) And most importantly, the oil contains esters - which reduce wear and friction.
The oil is fully synthetic, has the best temperature characteristics and its service life is not 40 thousand km, but judging by the American manual as much as 100 thousand miles, which is already 160 thousand km for our native Kilometers

Article codes for ordering in online stores:
0888602305 - 4L sheet
0888680807 - 1L plastic
00289ATFWS - 0.946mL plastic.

A search on Exist.ru yielded scant information. But Realparts.ru pleased with analogues that you can buy Yokki YCA041001P at a modest price.
In addition, on various forums, people claim that they use a complete analogue of Toyota ATF WS.
Idemitsu ATF Type TLS-LV, Lukoil ATF Synth Asia and Lukoil ATF.

There remains an open question.
What oils do you use? And what is your oil change interval? Do you have any experience.
From someone I heard that the Prius 20 box is very capricious and does not like long replacement periods and quickly fails.