Prediction of the Low-Temperature Cranking Characteristics of Engine Oils by Use of Laboratory Viscometers 650441

The correlation of extensive engine cranking data obtained by the Coordinating Research Council (CRC) with equally extensive viscometric data obtained by ASTM has shown that the low-temperature cranking characteristics of engine oils can be predicted by two high shear viscometers, the Ferranti-Shirley and the Forced-Ball (corrected for gel viscosity). The data collected also show that the extrapolated kinematic viscosity of multigraded engine oils has little or no value in predicting the low-temperature cranking characteristics of such oils. The abilities of other viscometers to correlate with the engine cranking data are also considered.


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