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Low-Temperature Compatibility of Engine Lubricants and the Risk of Engine Pumpability Failure
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Abstract
An investigation of an engine field-failure found low-temperature incompatibility to be the root-cause of an engine pumping failure. This was established from an examination of the rheology of the new and used oils. It was later discovered that some SAE multigrade oils that contain higher-cloud-point basestocks are incompatible with other same-W-grade oils that contain VI improvers that have a propensity to interact with wax precursors. The latter oils, which failed the Scanning Brookfield test, but not the TP1 mini-rotary viscometer test, were found to be incompatible with a number of commercial multigrade oils at low-temperature.
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Citation
Rhodes, R., "Low-Temperature Compatibility of Engine Lubricants and the Risk of Engine Pumpability Failure," SAE Technical Paper 932831, 1993, https://doi.org/10.4271/932831.Also In
Tribological Insights and Performance Characteristics of Modern Engine Lubricants
Number: SP-0996; Published: 1993-10-01
Number: SP-0996; Published: 1993-10-01
References
- “Standard Test Method for Predicting the Borderline Pumping Temperature of Engine Oil,” 1993 Annual Book of ASTM Standards
- “Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature,” 1993 Annual Book of ASTM Standards
- “Standard Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a Temperature-Scanning Technique,” 1993 Annual Book of ASTM Standards
- Selby, T. W. “The Scanning Brookfield Technique of Low-Temperature, Low-Shear Rheology - Its Inception, Development, and Applications,” Low Temperature Lubricant Rheology Measurement and Relevance to Engine Operation, ASTM STP 1143 Rhodes Robert B. American Society for Testing and Materials Philadelphia 1992
- Shaub, H. “A History of ASTM Accomplishments in Low Temperature Engine Oil Rheology: 1966-1991,” Low Temperature Lubricant Rheology Measurement and Relevance to Engine Operation, ASTM STP 1143 Rhodes Robert B. American Society for Testing and Materials Philadelphia 1992
- Selby, T. W. “Problems in Bench Test Prediction of Engine Oil Performance at Low Temperature,” SAE Technical Paper 922287 October 1992
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- Ver Strate, G. Struglinski, M. J. “Polymers as Rheology Modifiers,” A.C.S. Symposium Series #462 Schultz D. N. Glass J. E. American Chemical Society 1991 257 270
- Sen, A. Rubin, I. D. “Molecular Structures and Solution Viscosities of Ethylene-Propylene Copolymers,” Macromolecules 1990 23 2519 2524