Other quality standards
Automatic Transmission Fluids
The first, more generally used quality standard for this fluid was General Motors "Automatic Transmission Fluid, Type A" issued in 1951. This standard has been subsequently modified and, among other things, suffix A was added in 1957. Fluid according to this standard has been designated by us in our recommendations as ATF, type A.
In 1967, General Motors issued a new standard "Dexron" which presumes more modern and more extensive tests with rather more stringent demands. Later these demands have been increased further, and the designation for the standard is now Dexron IID.
Ford has its own standards. The earlier M2 C33-F has after altered demands been replaced by M2 C33-G. This standard prescribes, among other things, completely different friction characteristics, when compared to other oils for automatic transmissions, such as ATF type A and Dexron IID. The fluid which meets Ford's standard has been designated by us in our recommendations ATF, type G.
