Ok I know there are a million threads out there on this. And that is the problem, there is so much info it would take me a year to filter through it all. So I am going to humbly ask this question as clearly and concisely as I can.

I have an 07 v6 4WD T4R with 160k on the clock (last tranny flush at 80k and an 05 GX470 v8 4wd with 100K on the clock (no known trans flushes).

Anyway, I have 24 quarts of mobil1 in my garage waiting for me to get to it. My plan is to do four 3-quart flush and fills on each truck.

I plan on opening the overflow plug for the last flush and filling until overflow. and then driving it to get the fluid up to temp and opening the overflow to release the now-expanded hot fluid to the right operating levels.

Also, I have a Bluetooth ODB sensor that connects to my phone that I will use to check the trans temp. If I can get the trans temp up without taking it ooff the jack stands, I will.

Does anyone see any fallacy in this?

And of course Murphey's law still applies. as soon as I write the post I find what I am looking for...

https://www.tacomaworld.com/threads/...mission.63851/

Still gonna use my ODB thing though.

Mobil1 makes WS ATF?

Don't drive it, just let the vehicle warm up; you'll start to get into that temperature range really quick, if you drive it you're likely to overshoot the temperature and have to wait a few or more hours for it to cool off.

If you're going to do four 3-quart drain and fills, just do an exchange and get all the old fluid out at once so you are not mixing old and new fluid. It will take you less time with better results.

There is a link to a detailed write up in my signature to exchange all the fluid.

Don't even bother with the drain and fills. It is 90% of the effort of a full flush for 50% of the result. The only addition is disconnecting one of the trans hoses from the radiator and starting the engine instead of driving around and draining/filling.

These are the links I used when I did mine in May on my GX:
ATF Exchange (using the cooling line)

http://www.toyota-4runner.org/mainte...on-sealed.html

https://www.tacomaworld.com/threads/...mission.68462/

I don'tknow if it is WS but lots of guys said they have used it with good results. Am I making a mistake here?

Yeah, that's one way to do it and honestly it's roughly the same. I'd run 12qts through the system either way, but it does go by faster letting the transmission do the work for you.

The key thing here is that regardless of whatever method you choose, you still need to perform the fluid inspection procedure to make sure the vehicle is at the correct fluid level.

Eh... Honestly? I've been trying to get detailed information on what WS ATF actually is and isn't. I don't like running fluids that I cannot match up to factory specifications (meaning if there's not enough information on the fluid, then I'd rather assume it's not for that application than risk it), you should always run the specified fluids for the vehicle's application. Unfortunately in the case of WS ATF, I have no concrete evidence of what it is besides a special Toyota ATF. Some sources state it's a unique formula, others state it's a lightly modified Dexron VI ATF; none of them have strong enough evidence to either prove or disprove their points.

I've heard of people running Dexron VI in their vehicles and not having issues (knock on wood), while that's good anecdotal evidence; there's no way to test the fluid and see how effectively it's working without comparing it to a known good control. Which at this point we can't because we don't know what WS ATF is and what additives it has and what they are for...

Bottom line? I have no idea if it's good for the vehicle for not. I'm not a fan of "Universal" fluids because under scrutiny that claim tends to be very thin, if not outright untrue (for example engine coolants, I really only have found 2 alternatives to the Factory SLLC that actually meet the Toyota specifications). But it could be perfectly fine, lots of other people have thrown Dexron VI and some other non-Toyota ATFs and their transmissions haven't outright exploded yet; so that's at least a data point.

Well shit. Now you got me worried about the mobil1. I'll have to think on that one. Sucks though bc I already have it and like a Duma bass I bought it from Amazon so shipping it back will suck.

Anywho, about the level check. I plan on doing that, I was just going to use my odb scan tool on my phone to get the tans temp. Should I not?

Ok so I did some research and could not find any reliable info that says I can or should use Mobil1 ATF in my vehicles. and while I'm sure "it will be ok". that's not good enouh for me. I am doing this service to maximize the life of my vehicles, not marginalize them.

So now that I have a case of tranny oil to return. What would you recommend? I guess I could just head down to the Toyota dealership and get their ATF and call it a day.

Edit: I bought this when I had my amazon prime account and it will cost me nothing for uPS to come by and ship it back. Damn amazon is awesome. Now I will say that they are awesome at a price. but awesome nonetheless.

So, off to the dealership I go to get WS tranny fluid.

Looking at the specifications for Mobil 1 Synthetic ATF, it doesn't even match up for Dexron VI. It does say it's good for JASO A1 specification, but I can't find any relation to WS ATF with that. I couldn't find a correlation between JWS 3324 (one of the specifications WS ATF meets) and JASO A1, so I'd say the Mobil 1 is not the right stuff in this case.

If you can get the WS ATF for a good price at the dealer I'd say go for it, if not I think Amazon might have it. I would imagine Redline's Dexron VI or any high quality Dexron VI compatible fluid should work; but again, that's mainly based on other's empirical data and not anything scientific.

I appreciate your attention to this. One thing that baffles me though is that how is it that these transmissions are so different that mobil1 doesn't measure up? Why isn't a transmission a transmission and that's it. I am really bummed that through my own ignorance I almost put the wrong stuff in.

I just did the exchange method yesterday on mine. I bought a case of 12 qts Toyota WS off of ebay for ~$8/qt shipped to my door and ended up needing one more that I had to go get from the local dealer anyway for $10/qt so going to the dealer isn't really that big of a difference from the best price I found. I'm cheap but even I wouldn't bother with using a different fluid than OEM for this once in a 100k mile job.

Getting the trans up to temp with the jumper in pins 4 and 13 as described in the ATF exhange thread is very easy. In 40 F ambient temps it took mine ~30 mins at idle to get up to temp. No need for an OBD tool although I'm sure that'll work too if you're in the right temp range to check the fluid level. Follow the procedure as mentioned in the ATF exchange thread for level check.

I left mine up on jack stands for lots of room under it for pumping the new fluid in. Overall it would have taken me ~2hrs if I didn't end up short and have to gear up to ride my ktm up to the dealer for another quart.

Well I have decided to let jiffy lube do this. They said they would do for drain and fills for $140. 12 quarts of WS is $240 on amazon so for $40 I'll sit and watch.

Valvoline Maxlife ATF is about $18-19 per gallon at WalMart. Maxlife meets Toyota WS specs.