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Low-temperature engine oil pumpability has been a concern for OEMs, engine oil formulators, and additive manufacturers for a number of years particularly since a significant number of air-binding failures in 1980 and '81. On careful investigation of the cause of such field failures, it was found that oil sensitivity to a particular combination of weather conditions was responsible. The experience also suggested that many other lowtemperature weather conditions might produce enginedamaging gelation. Thus, it seemed desirable to develop a bench test that would induce and measure gelation that might form in engine oil by continuously measuring slowly cooling oil over an extensive lowtemperature range. This led to the development of the Scanning Brookfield Technique (SBT) first reported in 1982. Oil supply lines to Atmospheric Pressure 3 Oil pump Oil in sump valve-train and crankshaft 'Air-Binding' Process Oil Screen

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