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)
synthetic indigo is easier to make then natural indigo, synthetic indigo is made in laboratories and natural indigo are found on tropical plants
Rocks are a naturally occurring assemblage of minerals. They are not synthetic and would be described as having a crystalline rather than fibrous texture.
Hydrogen (H2) is not synthetic. Rather, it is the most abundant element in the universe. The reason that hydrogen is rather uncommon in its pure form on Earth is because it is extremely lightweight and fast moving. Thus, the atoms quickly escape through the atmosphere.
A bioprosthetic is another term for a bioprosthesis - a prosthesis made from biological, rather than synthetic material.
Toyota Echos have a timing chain rather than a timing belt so there is no need to change it.
steel if you are asking, ____ materials, then its SYNTHETIC
Big difference, Synthetic, generally refers to the thing itself being Synthetic, rather then Natural, whereas Man Made, refers to the process. Just because something is Man Made, does not by necessity make it Synthetic, look at all the man made mistakes in life, you wouldn't call them Synthetic Mistakes, would ya? or what about Man Made automobiles, you would call them Synthetic Transportation Vehicles would you? I mean,, cup cakes are man made, but are they Synthetic?
Synthetic clothes melt - rather than burn, they also react to chemicals. If the clothing gets too hot - it will melt onto the skin - causing deep burns.
Genuine raccoon fur signifies that the fur actually came from a raccoon rather than being synthetic.
Yes, you can use synthetic oil in our CR-V - but once you start using it it is best to continue using it at each oil change rather than switch back and forth.
A synthetic gem is usually less expensive. They can be made to specific shapes which facilitates their incorporation in certain uses. The bottom line is the economics of it, it saves money and time and increases profit margins.
"Toyota is not known for its sewing machines but rather for its automobiles. Toyota sewing machines are not in the top ranked sewing machines in consumer reviews. However, on sites such as Sears they have received positive reviews and their reliability does not appear to be an issue."