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A Laboratory Method for Predicting the Permanent Viscosity Loss of Polymeric Crankcase Oils in Field Service
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English
Abstract
A mechanical shearing test has been developed to evaluate the permanent viscosity loss of multigrade crankcase oils in field service. The test shows two advantages over a sonic shear test used previously. It causes polymer breakdown directionally the same as engines in the field, higher with higher viscosity oils; and test severity does not depend on the polymer type used. The new procedure provides a reliable laboratory technique for designing the used oil viscometric properties of multigrade formulations. Results from a 4 hr test predict the used oil viscosity with and without crankcase dilution, and also the extent of polymer breakdown in field service.
Citation
Pearce, A., "A Laboratory Method for Predicting the Permanent Viscosity Loss of Polymeric Crankcase Oils in Field Service," SAE Technical Paper 680069, 1968, https://doi.org/10.4271/680069.Also In
References
- Georgi C. W., “Viscosity Characteristics of Motor Oils at Higher Rates of Shear.” Proceedings of the Fourth World Petroluem Congress, Section VI, (1955) p. 211.
- Klaus E. E. and Fenske M. R., “Some Viscosity-Shear Characteristics of Lubricants.” Lubrication Engineering, Volume 11, (1955) p. 101.
- “The Effects of Polymer Degradation on Flow Properties of Fluids and Lubricants.” ASTM STP 382, American Society for Testing and Materials, 1965.
- H. D. Lawson for Committee D-2, Research Division VII-B, “Determination of Shear Stability of Non-Newtonian Liquids.” ASTM STP 182, American Society for Testing and Materials, 1955.
- West J. P. and Selby T. W., “The Effect of Engine Operation on the Viscometric Properties of Multigraded Engine Oils.” Paper 650445 presented at SAE Mid-Year Meeting, Chicago, May,1965.
- R. M. Goodson and G. K. Vick, “Viscosity Loss in Polymer-Thickened Oils During Use.” ASTM STP 382, American Society for Testing and Materials, 1965.
- ASTM Sonic Shear Test (Appendix XII, “ASTM Standards on Petroleum Products and Lubricants,” October, 1961).