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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.
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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 211
- Klaus E. E. Fenske M. R. “Some Viscosity-Shear Characteristics of Lubricants.” Lubrication Engineering 11 1955 101
- West J. P. Selby T. W. “The Effect of Engine Operation on the Viscometric Properties of Multigraded Engine Oils.” Paper 650445 presented at SAE Mid-Year Meeting May 1965