ATF: Amsoil Signature vs Toyota WS vs Idemitsu

ekolpack

Thread starter
Joined
Dec 22, 2021
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7
I'll tell you about what ATF I use for my vehicles. I use WS in my 2008 Toyota Sienna. It has over 375,000 miles and I have it changed every 50,000 miles. It is the original transmission and engine. I also have 4 Mercedes that I use Amsoil Transmission fluid in them. The 1983 240D has a manual tranny and now has 70,000 miles on the Amsoil and I'm going to change it every 100,000 miles. The 240D has over 327,000 miles and still shifts just great. My 1984 300SD has over 258,000 miles on it and over 30,000 miles on Amsoil ATF fluid and I'll change it out every 75,000 miles. Of course it runs and shifts just fine. My 1988 E300 gas car has over 280,000 miles on it and over 50,000 miles on the Amsoil ATF and when it shifts it is almost imperceptible!! Amsoil ATF at it's finest!! My 1995 E300d has over 173,000 miles and over 23,000 miles on the Amsoil ATF. And, as I'm sure you would imagine, it shifts very smoothly as well. I will change out the ATF every 75,000 miles on my 124's. WS didn't work out so well for you and you went with a great ATF. I also like the Amsoil ATF. The WS worked out very well for me. If it would not have done so, I would have went with the Amsoil ATF as well.

Wow, extremely helpful! Thank you! Honestly, I'm more impressed with the Merc trannies lasting that long. Toyota is known for making stuff that will last forever, even if poorly maintained (didn't Scotty have a 'yota in @ 100k with factory motor oil that was still in decent shape?). Their mechanical engineering and build quality is that good. You could probably run these trannies on canola oil and they'd last 300k.

But those kind of numbers are pretty incredible for Merc, especially consistently across several Mercs. I know it's not unheard of, but pretty **** rare. I would say this speaks more highly of Amsoil than WS. Not that it speaks poorly of WS, just that the performance of Amsoil seems exceptional.
 
Joined
Dec 15, 2010
Messages
309
Location
San Antonio,TX
07 Toy FJ Cruiser w/A750e tranny. Changed from WS to Amsoil ATL in 2010 @ 53k miles. Also installed a remote spin-on filter for the tranny. It now has 217k miles.

I change the spin-on filter every 2 yrs/25k miles and fluid every 4 yrs/50k miles. Not showing any sign of weakness.
 
Joined
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21,534
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Upper Midwest
07 Toy FJ Cruiser w/A750e tranny. Changed from WS to Amsoil ATL in 2010 @ 53k miles. Also installed a remote spin-on filter for the tranny. It now has 217k miles.

I change the spin-on filter every 2 yrs/25k miles and fluid every 4 yrs/50k miles. Not showing any sign of weakness.
Weakness?
 
Joined
May 12, 2018
Messages
324
Location
CA
Why is my new ATF almost as clean as new with towing weight at maximum to the Rav4at more then 40,000 miles. Could it be because it is a premium oil to handle the job without any question, and at the same cost? Group 2+ vs a Group 5. But then there are those "people" on BITOG that want to seem more virtuous then others on how they buy the cheapest and lowest grade "price point oil" and squeak by with good #s. Duh, I know dark oil doesn't mean bad oil, but I do know when the "crap price point WS" was dumped I got sick from the smell in a 24 x48 insulate garage and had to open up the door in a -10 below night till I could get rid of the burn't up crap WS oil. The WS could not handle the job and was so far degraded. Boy that WS is "so grand" it won the "so burn't I am going to vomit award that I need a respirator just to finish an oil change award." Go ahead use your WS with pride. I will run a "non price point" oil, and pay the same, and far far far exceed WS in performance across the board.
Lol
 
Joined
Feb 20, 2007
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5,988
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Vote here for amsoil.

used in 2006 tundra which saw heavy towing duty. Bought it at 100k, not owners had previously towed with it. Swapped to amsoil and shifting markedly improved from what it was. Added a spin-on filter which also gave me occassional visual sight of the fluid. Sold the truck 60k later. We towed heavy with it, a 6100 lb load and the truck was rated for 6900. transmission never missed a beat.

also moved the 2014 Lexus to it as well. No issues.

i prefer it over maxlife, which is probably the most popular here. IMO, amsoil has a quicker, more succinct shift feel, by a tiny margin. I have used both amsoil and maxlife in toyotas for friends.

Ams. is also my goto for Honda and Chrysler products as well. They do not have a ULV formulation which works well with ford yet.
 
Joined
Feb 20, 2019
Messages
93
Location
Philippines
Use AISIN AFW+ fully synthetic ATF thats WS compatible. I also have a Hayden 679 oil cooler with a Magnefine filter attached inline. I do full fluid exchange every 60,000 miles and my A750F transmission shifts like brand new.
 
Joined
Aug 30, 2004
Messages
26,778
Location
CA
Just bought 5 gallons of Amsoil OE Trans fluid. I have bought 3-1/2 gallons in the past, put it in my 2015 Lexus RX350. No problems.

I am planning on draining/filling my 2014 Tundra and 2013 Lexus LX570 with it also.

I'm not an Amsoil fanboy but I'm starting to think about it.
If you're going to use Amsoil, buy their Signature Series.

From their description, OE is more comparable to the many multi-vehicle fluids sold at Walmart.
 
Joined
Dec 13, 2019
Messages
69
Location
America
I currently have Schaeffers 205A in my 14 tundra and its great. 234k miles. I ran 204SAT before this. Same fluid, just a little thicker. No issues with that either, got a UOA on it when changed at 45k? miles. Gonna switch to HPL trans fluid once this gets to about 40-50k, then I'll finally have the same brand fluid throughout the entire truck.
 
Joined
Jan 6, 2016
Messages
19
Location
Sydney, Australia
I had an older Lexus SC400 4 speed auto (purchase at 30,000km) which uses the Toyota Type -IV fluid. I did spill and fill every 50,000km with Toyota Type-IV and the transmission failed at just shy of 600,000km I was towing a motorcycle at that time. I was trying to push for 1M km but that didn't happen. To Toyota and Lexus credit they did make a great vehicle as most people will sell/dump their car at less than 200,000km or is considered end of life.

Toyota/Lexus is a car company and wants to sell you new cars. If they make everything to last forever they will be out of business real quick.

I just wish I knew about aftermarket 100% synthetic transmission fluid in the past such as Amsoil then I might make it to 1M km.

I'm currently using Amsoil ATL in an Infiniti Q50s hybrid which uses Matic S fluid and Jaguar XKR which has a ZF transmission which uses Shell M-1375.4.

I like the extra protection given by Amsoil ATL when I drive my cars quite spiritedly wink wink. When the transmission are at the pointy end of very high temperatures (monitored via OBD2 port) knowing that the transmission oil is not breaking down as earlier than the OEM fluid.
 
Joined
Jul 13, 2003
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Tracy, CA
I drain/refill the Lexus A650E with Edemitsu T-IV. If I would have known the local Monument Auto carried Aisin T-IV and Mobil 3309, I could have saved a few dollars on shipping a case of fluid.
 
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May 27, 2008
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Parts Unknown
Why is my new ATF almost as clean as new with towing weight at maximum to the Rav4at more then 40,000 miles. Could it be because it is a premium oil to handle the job without any question, and at the same cost? Group 2+ vs a Group 5. But then there are those "people" on BITOG that want to seem more virtuous then others on how they buy the cheapest and lowest grade "price point oil" and squeak by with good #s. Duh, I know dark oil doesn't mean bad oil, but I do know when the "crap price point WS" was dumped I got sick from the smell in a 24 x48 insulate garage and had to open up the door in a -10 below night till I could get rid of the burn't up crap WS oil. The WS could not handle the job and was so far degraded. Boy that WS is "so grand" it won the "so burn't I am going to vomit award that I need a respirator just to finish an oil change award." Go ahead use your WS with pride. I will run a "non price point" oil, and pay the same, and far far far exceed WS in performance across the board.
Redline doesn't claim it's a Group 5. It's really a Group 4 basestock ATF.
 
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