Considerations in Design of a Type F Automatic Transmission Fluid

The development of a Type F automatic transmission fluid requires care in selection of base stocks and additives in order to achieve the desired balance of performance properties. Considerations involved in selection of antiwear agents, detergents-dispersants and antioxidants are enumerated. Tests are described for use in evaluating the additives, and performance properties of fully formulated fluids are shown. The performance of non-Type F automatic transmission fluids in transmissions designed specifically for Type F fluids are described.