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Factory-service automatic transmission fluids possess physical properties and performance features which differ substantially from the minimum Type A, Suffix A specification requirements. In some cases either the transmission life would be impaired by the use of a minimum Type A, Suffix A fluid, or desirable performance features would be deteriorated. These special factory requirements are discussed including low-temperature fluidity, frictional properties, clutch durability, antiwear characteristics, elastomer compatibility, and oxidative stability. The specialty factory fluids present questions concerning make-up oil additions and drain and refill practices. In spite of these, however, transmission manufacturers will continue to include the lubricant as an integral part of the total design. Thus service-station fluids should be carefully chosen to compromise manufacturers' conflicting recommendations.
Sprague, S. R.
Research Engineer, Research Laboratory, Shell Oil Co., Wood River, Ill
Woodruff, R. L.
Group Leader, Research Laboratory, Shell Oil Co., Wood River, Ill