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Shear Stability of Automatic Transmission Fluids -- Methods and Analysis A Study by the International Lubricants Standardization and Approval Committee (ILSAC) ATF Subcommittee
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Abstract
This paper discusses four methods for measuring the resistance of transmission fluids to permanent viscosity loss through shear. The four methods include the Fuel Injector Shear Stability test, the Sonic shear test, the DEXRON®-III Cycling test and the KRL test. Each of these methods and their advantages are discussed and data provided for many OEM fluids and the effects of these methods on the final viscosity. The data indicates the KRL generates the maximum shear stress on the fluids compared to the other methods. The data also indicates the sonic shear method results are similar to those of the KRL test. The fuel injector test imparts the least stress to the fluid. Data is presented to show the correlation between viscosity changes obtained using these methods and viscosity changes observed with mileage accumulation in vehicle transmissions.
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Authors
Citation
Sprys, J., Doi, J., Furumoto, M., Hoshikawa, N. et al., "Shear Stability of Automatic Transmission Fluids -- Methods and Analysis A Study by the International Lubricants Standardization and Approval Committee (ILSAC) ATF Subcommittee," SAE Technical Paper 982673, 1998, https://doi.org/10.4271/982673.Also In
References
- Linden J.L. Kemp S.P. “Improved Transaxle Performance at Low Temperature with Reduced Viscosity Automatic Transmission Fluids” SAE Paper 870356
- MERCON Automatic Transmission Fluid Specification Ford Motor Company Livonia MI
- DEXRON Automatic Transmission Fluid Specification, GM-6297M GM ATF Committee, GM Global Research and Development Center Warren, MI April 1993
- JASO Test Method 348-95, Japanese Automobile Standard Test Method for Friction Properties of Automatic Transmission Fluids Japanese Automobile Manufacturers Association Tokyo, Japan
- CEC Test Method CEC L-45-T-93 - Viscosity Shear Stability of Transmission Lubricants (KRL-Tapered Roller Bearing Test Rig) Shear Stability Test 1993 Coordinating European Council Madou Plaza - 25th Floor, Place Madou 1 B-1030 Brussels, Belgium