Best transmission oil

So what do you think I should use for my 2017 Tacoma or auto tranny?

 

If you don't want to use Toyota ATF WS you can find a list of alternatives here https://www.tacomaworld.com/threads...a-ws-atf-automaitc-transmission-fluid.373083/

 

This!

 

The modern automatic transmission is about the most expensive and fussy part of the vehicle to repair -- use the Genuine Toyota fluid.

 

If the transmission requires GL-4, I HIGHLY recommend Ford Unicorn tears or Redline MTL. Both are extensively used in the Miata community where notchy shifts are often solved by using these fluids. Most Ford dealers keep the Unicorn Tears in stock. Makes a huge difference depending on whatever stuff the factory uses.
https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oil

$33 Ford Genuine Ford Fluid XT-M5-QS Full Synthetic Manual Transmission Fluid - 1 Quart , black

https://www.amazon.com/Genuine-Ford-XT-M5-QS-Synthetic-Transmission/dp/B000NUES82?th=1

GL-5 contains over twice as many additives as GL-4, mainly sulfur and phosphorus products. This is good in high-pressure applications (differentials), but sulfur and phosphorus react with bronze and copper. Your synchros just so happen to be made out of either copper or brass. GL-5 does not supersede GL-4, the GL rating is how much pressure can be sustained without any metal-to-metal contact between components.

Here's a great article on GL-4 vs GL-5, including pictures of a worn-out Toyota synchronizer.
https://www.widman.biz/uploads/Transaxle_oil.pdf

Automatics don't care as much what you put into them.

 

Is online the only place I can buy that oil or is there an actual storefront.

 

You can buy it any Toyota dealership.

 

Thanks