The low-temperature pumpability performance of multigrade engine oils was evaluated in several United States and European engines. Test oils included both experimental formulations and commercial service station oils; test temperatures ranged between -20 and 0 F.The time for oil to reach engine rocker arms after startup at -15 F and -20 F was not related to low-temperature lubricant properties such as pour point and Brookfield viscosity. Pumpability (that is, oil gallery pressurization rate) of the oils improved markedly in successive cold-temperature starts, probably because of fuel dilution and shearing of microstructures in the oil. Engine design features can significantly affect pumpability performance.The low-temperature pumpability performance of multigrade engine oils was evaluated in several United States and European engines. Test oils included both experimental formulations and commercial service station oils; test temperatures ranged between -20 and 0 F.The time for oil to reach engine rocker arms after startup at -15 F and -20 F was not related to low-temperature lubricant properties such as pour point and Brookfield viscosity. Pumpability (that is, oil gallery pressurization rate) of the oils improved markedly in successive cold-temperature starts, probably because of fuel dilution and shearing of microstructures in the oil. Engine design features can significantly affect pumpability performance.The low-temperature pumpability performance of multigrade engine oils was evaluated in several United States and European engines. Test oils included both experimental formulations and commercial service station oils; test temperatures ranged between -20 and 0 F.The time for oil to reach engine rocker arms after startup at -15 F and -20 F was not related to low-temperature lubricant properties such as pour point and Brookfield viscosity. Pumpability (that is, oil gallery pressurization rate) of the oils improved markedly in successive cold-temperature starts, probably because of fuel dilution and shearing of microstructures in the oil. Engine design features can significantly affect pumpability performance.
Pumpability of Multigrade Engine Oils at Low Temperature
Sae Technical Papers
1971 Automotive Engineering Congress and Exposition ; 1971
1971-02-01
Conference paper
English
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