Originally Posted by wdn
Castrol Transmax full synthetic multi-vehicle ATF is certified for use in all Toyota vehicles.
Recommended for and certified/licensed aren't the same. As far as I know, Toyota does not license any fluid except for their own. Aisin has a WS fluid, but they are owned in part by Toyota so I'm pretty positive that it's the same fluid. GM sells GM labeled WS fluid for their Vibe which is basically a Matrix.
There is a Mobil ATF 3324 (JWS 3324, or Toyota WS).... I've never actually seen any of it though, only on Mobil's website.
On my last drain/fill on my 07 Tacoma I used about 3.2 quarts of Maxlife, which is now mixed with somewhere in the neighborhood of 9 quarts of WS. About 20k miles prior the drain/fill I did a cooler line flush with WS. The WS that came out of the pan on this drain/fill looked new despite some heavy towing and a lot of short trips. The WS I flushed out the first time at around 60k was nearly black, but smelled ok.
I did a drain/fill at 51k before a roadtrip and it was pretty black, so that's what prompted me to flush it.
The transmission is shifting as good or better than before with the Maxlife in there so I am going to keep using it. I got a couple cases at Napa a while back for $4/quart. When I run out of that I'll start buying the gallon jugs at Walmart for $17 or $18. I'm also using Maxlife ATF for the PS, my rack and pinion is seeping slightly and wetting the bottom of the boots, but that started on the factory fluid, I flushed it with M1 synthetic ATF, then several more times over the last few years with Maxlife. It's not really leaking and I don't ever have to add fluid, so until it starts doing more than weeping slightly I'm not aiming to fix it.