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This paper presents results obtained with detergent-type motor oils in laboratory and field studies under low temperature conditions. Light truck and passenger car field tests, carried out under rigidly controlled conditions, show that a significant reduction in sludge and ring zone deposits can be obtained by the use of low or moderate concentrations of detergent type additives. However, in light truck field tests, a high detergency motor oil showed no advantage over a high quality, heavy duty oil of lower additive content and detergency level. It should not be assumed, therefore, that high additive concentrations or high levels of detergency per se, are a guarantee of outstanding performance under all service conditions. A system of running low temperature, CRC, FL-2 laboratory engine tests on experimental oils based on the use of a standard lubricating oil and fuel combination is also presented. Ring zone and sludge deposits obtained in this test correlate with those obtained under low temperature engine service conditions in the field. However, the absolute levels of deposits in the FL-2 test are low, and there is a need for a better laboratory engine test technique for measuring the low temperature engine service performance characteristics of motor oils.
Boehm, A. B.
Enjay Company, New York, N. Y.
Tongberg, C. O.
Standard Oil Development Co., Elizabeth, N. J.