Abstract

Research materials on the analysis of the quality and influence of diesel fuel characteristics on the properties of engine oil are presented. The relationship of some characteristics of diesel fuel with the service life of engine oil in engines of agricultural machinery has been established as a first approximation. A selective analysis of the physico-chemical characteristics of fuels purchased from commercial structures and stored in oil depots of farms showed that 50 percent of the samples had an increased sulfur content, a weighted fractional composition, and low-temperature properties did not correspond to the values declared in the quality certificates. It was noted that the number of used motor oils M-10G2 and M-10DM with deviations from the requirements of the standards has significantly decreased. An intensive change in the color of the oil is observed during the use in tractor engines in the first hours of operation, the base number decreases, the content of insoluble sediment and the acid number of engine oil increases. It has been established that, despite the different technical condition, the load in many respects, the accumulation of resins and oxidation products depends on the quality of the diesel fuel used. The dependences of the change in the base number of M-10G2 and M-10DM oils over a period of 100 hours of operation were obtained when using fuel that meets the requirements of GOST and fuel with a weighted fractional composition. It was found that the base number of M-10DM oil decreased from 8 mg KOH/g to 5.3 mg KOH/g, while when using fuel with a weighted fractional composition, the base number decreased to 4.7 mg KOH/g. Similar changes were observed in the engines of tractors running on M-10G2 oil. It has been determined that the lower the quality of diesel fuel, the more contaminants accumulate in the engine oil and the properties of the oil decrease more intensively, which ultimately affects its service life before replacement.

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