Stuart, auto transmissions vary in design and therefore need differing fluids to meet their particular specifications. Different additives and friction modifyers are employed depending on the type of valve operation, clutch bands, friction plates, torque converters, etc, that are used in autoboxes . That's why it's important to stick to the ATF recommended by the manufacturer. You can use a fluid that is out of spec for your car, but you run the risk of ending up having poor gear changes. Toyota type T-IV is recommended for our cars and supercedes type T-II (which is no longer available). It's actually made for Toyota by Mobil and is known as Mobil 3309, available on ebay. Hope this helps.