Although I don't have a Toyota, one of my cars (my MKZ) uses Motorcraft Primium Automatic Transmission Fluid, which is the same as the Toyota T-IV and the Mobil ATF-3309. My other car (my Continental) uses the Mercon-V. Sure, there are synthetic fluids that I can use in both cars, like AmsOil ATF, but I found one that not only is less expensive than AmsOil or Mobil 1 ATF's, but is also less expensive than many non synthetic fluids. I had put the following in a different thread a week or so ago.
I purchased Wolf's Head Super Universal SYNTHETIC ATF. Front lable says it can be used with Traditional Automatic Transmissions and with Continuously Variable Transmission.
Back lable says "This product is engineered to meet the performance requirements of every automatic transmission fluid including, but not limited to GM Dexron III-H (does not mention Dexron VI), Ford Mercon V, edes Benz MB 236.9, ATF+3, ATF+4, Mitsubishi SP II/III, Toyota T-IV and many others. This dynamic new fluid is designed for use in the new continuously variable transmission (CVT) as well as the more traditional automatic transmissions, automotive power steering units, and automotive hydraulic systems. (It also says that it is engineered to meet the performance requirements of every American, European, Korean, Japanese and other automotive transmissions manufactured around the world.)
I like the idea of this full synthetic fluid because I can use it in both my cars. Earlier this week, I did a pump out and refill on my Continental. Pumped out eight quarts, and replaced it with this Wolf's Head. Went out and purchased an additional eight quarts (at $3.59 a quart) for the next time I do a change with either car.
I just like the idea of having a fluid that I can use in either car, plus the price is right. ($3.95 a quart at my local Auto Parts Store [not a national store, but a local store]) I also read about it in
www.wolfshead.com