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According to a Toyota Technical Service Bulletin dated 6/28/07, 2004-2008 Toyota vehicles equipped with automatic transaxles using ATF-WS does NOT require any flushing or changing during the life of the vehicle. Inspection of the fluid is recommended at 100,000 miles.

Toyota also states that ATF-WS is NOT compatible with Toyota T-IV or Dexron ATF. Should a fluid change be necessary, a special service tool to fill the transmission is required. The bulletin also states that containers of ATF-WS should always be sealed, otherwise the fluid will absorb moisture and potentially cause shift concerns if used in operation.

Although I personally use Amsoil motor oils and transmission oil for my own vehicles and believe it's a great oil, for a vehicle using ATF-WS, I would stay with that and not change to Amsoil due to the warnings about incompatibility with the T-IV and Dexron types of fluids. Because of the hygroscopic nature of the ATF-WS, it sounds like the basic chemical composition of the oil differs from the typical transmission fluids. I don't have MSDS data at this time, but it would be interesting to do more research to find out. If there's any potential for abnormalities in shifting, and until Amsoil makes a product that specifically meets the ATF-WS specs, I would say it's best to stick with the manufacturer's (Toyota's) recommendation, especially in this case.



AMSOIL recently reformulated their ATF fluids and does recommend their ATF for your vehicle:


2004 TOYOTA 4-RUNNER 4.7L 8-cyl Engine Code 2UZ-FE LUBRICANTS & FLUIDS:
Automatic Transmission,A750F......WS
Low Viscosity Synthetic ATF (ATLQT)
Automatic Transmission,A340E......TIV
Synthetic Universal Automatic Transmission Fluid (ATFQT)
Automatic Transmission,A340F......TIV
Synthetic Universal Automatic Transmission Fluid (ATFQT)
Automatic Transmission,A750E......WS
Low Viscosity Synthetic ATF (ATLQT)

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Q: Can you use amsoil synthetic fluid rather than Toyota WS-transmission fluid in your 2004 four runner?
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