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One of the most important functions of a gasoline engine crankcase lubricant is adequate control of the formation of varnish and sludge deposits in engines in service. Measuring or predicting the ability of lubricants to perform this function, based on laboratory tests, is very difficult because of the many types of engines in service use and, for each given engine, many different types of operating conditions. Most of the individual engineering departments of the major American automotive and petroleum companies have developed for their own use a wide variety of laboratory tests for this purpose. In 1958 the Program and Analysis Panel of the CRC Motor Engine Varnish and Sludge Group formed a sub-panel having the assignment of preparing a program aimed at the development of a test technique employing the singlecylinder Cooperative Lubricant Research (CLR) oil test engine which would give the desired correlation with varnish and sludge ratings in field service. This project was supported by the voluntary participation of over 20 laboratories which contributed generously in both man-hours and engine operating time. The L-43 technique described here resulted from this effort. However, the work is not complete; and additional programs are being planned by the participants in this cooperative work. Considerable additional effort will be required before a suitable technique that satisfies the objectives of the program is developed.
McLaughlin, E. J.
California Chemical Co., San Francisco, Calif