2019 + Transmission fluid check Proceedure ?

Hey guys , since the change to no trans cooler on the 2019 + Tundras , does anyone know if there is an updated procedure on how to properly check / add trans fluid ?

I am wanting to change over to Amsoil Signature synthetic fluid to help offset the added heat when towing in my 19" tundra , Since there is no thermostat to pin open I wonder if the service procedure has changed . anyone with any insight on this ?, or maybe a Toyota tech could chime in and copy/paste the procedure from Toyota service info. much appreciated guys !

 

The procedure for pinning open the valve to the external cooler was changed many years ago. Not just recently. I know from at least 14 plus, they added a routine to the shifter to cause the D to flash when the oil temperature got to the proper temperature. There are several threads about this on the internet.

I'd say the 19 plus has changed and there is no telling exactly what you have to do now. You can pay for a 2day pass to Toyota's service website. I don't know for certain if you will find it there but it is probably your best bet to find it.

https://techinfo.toyota.com/

Personally, I believe people are over blowing the issue. That said, Amsoil makes good stuff. Can't hurt. If it makes you feel better about it then go for it. I would just bet if Toyota find out you did it, they probably will not cover you under warranty. I know people will argue this but why would they? Something to consider. You might want to ask Toyota customer care before doing it.

 

Thanks for the link !

I agree some people are over blowing the issue , some people are spending hundreds on all the parts needed to install a 2018 and prior factory cooler .

However there cannot be anything to worry about by changing over to Amsoil trans fluid , I had done this on other vehicles in the past at low miles without issues , Toyota factory fluid happens to be a non synthetic . Amsoil is far superior for heat resistance and fluid life , It meets/surpasses the Toyota fluid requirements. The upgrade is worth it imo . Being a automotive tech myself I know Toyota will not spend the time or money to analyze the fluid if there were any mechanical failures while under warranty . Also there are laws in place to protect consumers who choose to do their own maintenance without dealers voiding warranty.

 

I'd bet money this is the WS trans fluid in our trucks, appears to be synthetic. Click on the applications tab on that site.

https://www.summitracing.com/parts/asn-atf-0ws

 

I always thought it probably was but that is the first time I've seen it that way. Thanks for sharing.

 

Yes the aisin brand is synthetic , however on the genuine toyota ws bottle it nowhere says synthetic on it . It is a lower viscosity fluid which would hint towards a synthetic but it might be a blend . I have yet to see reputable info

 

The fact it shows it as Toyota WS under the applications, is good enough for me. Also it is engineeded by Aisin for Aisin transmissions and I can't imagine Toyota wouldn't be using it.

Check page 7.
States Aisin atf 0WS formulated for vehicles using TYPE WS.

https://aisinaftermarket.com/upload..._vehicles_using_TYPE_WS-E51EEN_MSDS_34_EN.pdf

 

The aisin fluid looks to be a upgrade from the factory oem toyota fluid , I highly doubt Aisin makes it for toyota . If you look at the OEM bottle of toyota WS , it is the identical bottle as Mobil brand except black in color , I have also heard that Mobil makes the fluid for toyota in the past .
Either way my point above was that theres tests that prove amsoil signature trans fluid outperforms all other brands . it withstands heat way better and has a superior additive package , and with the change in cooling to the 19+ transmissions I would rather run the ultimate in trans fluid. fluid is cheap insurance in my eyes .

 

I used Amsoil Signature ATF in my previous Subaru WRX STI powersteering system. That thing would cook the Subaru ATF really quickly, even without track time. Once I switched to the Amsoil, the system quieted down significantly and retained its color for a lot longer.

 

No arguement from me that Amsoil could be better. I wish though there was some way of adding more than just the 3-4 litres that come out of a drain. No way to flush it all out without the thermostat and trans lines.

 

I agree 100% , our only option is to drain and fill 3 or 4 times and hope for the best

 

You repeat the process three times and it exchanges all the fluid. I tested it and it worked. Just don't run the engine any longer than a few seconds after each drain. This is what the Toyota service manual tells you to do. At least the 2015 manual that I have.

 

The dealers use the older trans cooler plate when they do flushes on trucks that just have the warmer. Thats the only way to do a complete fluid change.

 

It picks up from the pan and runs it through the system. If you drain the pan and add fluid, let it run down, it will put clean ATF through the system each time. The final drain I did the ATF looked new. It didn't till the final drain.

At least that is my experience.

 

On side note, I read that the High Temp warning is somewhere around 300 degrees. The flash point of WS ATF is over 400 degrees. At least the Aisin version.

 

yeah , If only our trucks came with Aisin brand synthetic fluid from factory . Also Its not so much the flash point that matters but with trans fluid its the hotter the fluid gets the life span of it decreases and the higher the chance of varnishing and lubricity loss , that's when clutches start burning up. . I suggest anyone with a 2019 + change the fluid more often than the owners manual suggests , especially if towing. Better safe than sorry .

 

Always good to change fluid often if you tow much at all.

I do wonder what the specs on WS as whole might be. I'm skeptical of some of the temps I've seen where ATF starts to break down. I believe they are rather old numbers and may not be applicable to modern fluids. Even if they're not synthetic. Synthetic has become more of a marketing slogan at times than it should be. I'm certain Amsoil has it right.... not sure about others.

 

Toyota WS is made by Exxon/Mobil, it says it right on the back label

 

I remember seeing Japan on the one's I've seen. Probably several different people making it to spec.

 

Yes, ExxonMobil makes it in Japan too... Most of the WS ATF you'll see here comes from US or Canada though