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A Laboratory Method for Predicting the Permanent Viscosity Loss of Polymeric Crankcase Oils in Field Service
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1968 by SAE International in United States
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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.
CitationPearce, 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.
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