Factory-Service Automatic Transmission Fluid Requirements

    Published: Jan 1963

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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.

    Author Information:

    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

    Committee/Subcommittee: D02.B0

    DOI: 10.1520/STP43716S

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