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Automatic Transmission Fluid Viscosity Requirements
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1971 by SAE International in United States
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Performance-based test techniques were developed to determine high- and low-temperature automatic transmission fluid viscosity requirements. High-temperature fluid viscosity requirements were determined using engine-transmission-dynamometer tests. Low-temperature fluid viscosity requirements were established with a motor-driven 3-speed transmission apparatus. It is concluded that the current used-fluid Dexron viscosity limit of 5.5 cs minimum at 210 F provides a good safety factor for preventing excessive internal leakage at high temperatures. Since some Dexron fluids have -40 F viscosities approaching the 55,000 cp specification limit, lowering it will be considered in future specifications.
CitationHaviland, M. and Davison, E., "Automatic Transmission Fluid Viscosity Requirements," SAE Technical Paper 710838, 1971, https://doi.org/10.4271/710838.
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