Toyota and Lexus hybrid eCVT ATF fluids?

[Bumbobee]

Hey everyone.

Got a Lexus UX250H hybrid and looking at changing the eCVT and rear motor fluid. Vehicle is approaching 100 k KM (60 k miles).

I'm looking into options of using a full synthetic fluid instead of Toyota WS. Looking into Amsoil, Redline, or even Valvoline has a hybrid specific ATF fluid. Royal purple ATF etc.

What do you guys think? Any issues or problems from Toyota hybrid owners that have changed their fluid with non Toyota WS? I believe most hybrids take the same fluid, aside from the newest 5th gen ones that have a specific one from Toyota even different than WS.

 

[dippschtick]

Aisin ATF-0WS full synthetic
https://aisinaftermarket.com/products/31/6

Available at Rock Auto

 

[FZ1]

Hey everyone.

Got a Lexus UX250H hybrid and looking at changing the eCVT and rear motor fluid. Vehicle is approaching 100 k KM (60 k miles).

I'm looking into options of using a full synthetic fluid instead of Toyota WS. Looking into Amsoil, Redline, or even Valvoline has a hybrid specific ATF fluid. Royal purple ATF etc.

What do you guys think? Any issues or problems from Toyota hybrid owners that have changed their fluid with non Toyota WS? I believe most hybrids take the same fluid, aside from the newest 5th gen ones that have a specific one from Toyota even different than WS.

Best to stay with the oem trans fluid. .02

 

[The Critic]

I wouldn't get too hung up on "synthetic" fluids in a transmission -- the other properties are equal or more important.

 

[DirectRejection]

I wouldn't get too hung up on "synthetic" fluids in a transmission -- the other properties are equal or more important.

Exactly. The replacement ULV fluid for WS in more recent model years is also Group III.

 

[meep]

This car won’t care. There are no clutches and very few gears. Me personally, amsoil all the way, and in all fairness it could probably last the life of the car. Maxlife synthetic would also be a solid win as well. Toyota has a win with this transmission.

 

[VersysVsWhat]

This car won’t care. There are no clutches and very few gears. Me personally, amsoil all the way, and in all fairness it could probably last the life of the car. Maxlife synthetic would also be a solid win as well. Toyota has a win with this transmission.

Yep, it is a very forgiving, robust/durable design.

I recently put Valvoline Hybrid (Copper care) ATF fluid in my spouse's Prius C. Previously I put some Castrol ATF in it. Both have been fine.

 

[GR_CoB]

2012 Toyota Prius C. I used this fluid instead of Toyota WS, no complaints yet.

 

[VersysVsWhat]

2012 Toyota Prius C. I used this fluid instead of Toyota WS, no complaints yet.
View attachment 284203

The above is what I recently put in.

 

[MurkyAsparagus]

With these eCVTs, I would really only use Toyota ATF-WS or the like from Aisin. They’re bulletproof if they’re maintained, and not even well, just occasionally. I serviced my Camry Hybrid eCVT at 105k and the fluid looked hardly used. There’s no debris and not a ton of heat, so the fluid lasts a long time.

 

[VersysVsWhat]

With these eCVTs, I would really only use Toyota ATF-WS or the like from Aisin. They’re bulletproof if they’re maintained, and not even well, just occasionally. I serviced my Camry Hybrid eCVT at 105k and the fluid looked hardly used. There’s no debris and not a ton of heat, so the fluid lasts a long time.*

* My use of bold emphasis above

I think you perfectly explained why you can use non OEM fluid here, and have a lot more options. I think with more traditional transmissions, it is a smarter idea to stick with OEM fluid or at least something as close as possible.

 

[DirectRejection]

2012 Toyota Prius C. I used this fluid instead of Toyota WS, no complaints yet.
View attachment 284203

For the record:

Valvoline HV KV100 5.9
Toyota Genuine WS KV100 5.7

HPL Green KV100 6.4
HPL Teal KV100 4.6

AMSOIL ATL KV100 6.3
AMSOIL ULV KV100 4.5

I just changed my rear differential fluid with TG eTransaxle Fluid TE.
The rear axle is powered by a ~25HP electric motor and small differential.

I should be fine with HPL Teal (4.6) in the eCVT, spec'd for the TE (3.3).
FCI will be long (>100k miles).

Thank you to @MolaKule for the expert input at my thread on this subject.

 

[DirectRejection]

Hey everyone.

Got a Lexus UX250H hybrid and looking at changing the eCVT and rear motor fluid. Vehicle is approaching 100 k KM (60 k miles).

I'm looking into options of using a full synthetic fluid instead of Toyota WS. Looking into Amsoil, Redline, or even Valvoline has a hybrid specific ATF fluid. Royal purple ATF etc.

What do you guys think? Any issues or problems from Toyota hybrid owners that have changed their fluid with non Toyota WS? I believe most hybrids take the same fluid, aside from the newest 5th gen ones that have a specific one from Toyota even different than WS.

My 2019 UX 250H F-Sport used WS at eCVT & Rear Differential.

I just now walked into a Lexus dealership and was told by the Service Department Manager that Lexus STILL uses WS in 2025 MY, and not the very thin eTransaxle Fluid TE !

Under the VIN sticker at driver's side door jam, it will display whether your eCVT is the old or the updated and improved w/tweaks eCVT. Something like "A/TM /PB10", which I believe is the updated unit.

It sure seems, in my view, that a fully synthetic WS compatible fluid, with adequate copper corrosion protection, would be a fine choice, especially with Toyota and Lexus in flux.

 

[ATex7239]

I prefer the OEM fluids. Last two hybrids we owned I did it around 85K-100K miles without any issues. Planing on doing the same with the one we have currently.

 

[DirectRejection]

I prefer the OEM fluids. Last two hybrids we owned I did it around 85K-100K miles without any issues. Planing on doing the same with the one we have currently.

Respect.

I have recently changed my thinking on this. From strictly OEM to best possible compatible fluid.

Toyota's eCVT is "planetary" and IMO bonding high quality esters equals longevity and best protection.

It's not your Grandfather's automatic transmission at all.

 

[ndarkside93]

I service my moms 2016 rav4 hybrid with the idemitau equivalent of Toyota WS. It’s been performing admirably the past 20k miles in her car and will be getting changed in the next 5k miles just to test. Will say the electric rear differential on these tends to have more wear and darker fluid than the eCVT.