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Because the analyses of many samples of new and of diluted crankcase oil had not been completed by the Bureau of Standards when the results of the winter tests were reported at the 1923 Semi-Annual Meeting, the report on these dilution data was delayed. This information has since become available and forms the basis of this paper. After reviewing the results of the winter tests as already reported, stating the names of the cooperating companies and tabulating the cars and the mileage distribution in the test runs, the author discusses the results of the analyses of fresh crankcase oils and the dilution results before making a comparison between those obtained under summer and under winter conditions. Dilution versus mileage, the subjects of dilution, viscosity and specific gravity and the distillation of composite oil samples are presented next, followed by comments upon crankcase-oil consumption. Numerous tables and charts are included, and a summary of the results is made.