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The content of wear metals in engine oils allow you to control over time both the change in the properties of oils and the serviceability of engine components. An analysis of the pattern of changes in the elemental composition of the oil makes it possible to evaluate the effectiveness of the use of flushing and break-in motor oils, to control the process of cleaning used oils and changes in the properties of oils in agricultural machinery engines during the off-season storage period. Determination of wear elements (iron, aluminium, copper and chromium) was carried out on an MGA-915M atomic absorption spectrometer manufactured by Lumex LLC Atompribor. The running-in efficiency of the D-240 engine was controlled by changing the concentration of wear elements. The composition of the break-in oil included: 1% of the mass. urea + 0.5% wt. graphene concentrate + 1% wt. oleic acid - the rest is refined motor oil. A pyro-coated graphite furnace with a Lvov platform was used as an atomizer. A working preservation oil containing an additional 6% polymerized rapeseed oil and 6% gun grease was prepared on the basis of purified M-10DM motor oil. Solutions of engine oil samples were prepared by diluting them with methyl isobutyl ketone, chemically pure grade. Flushing oil obtained by refining used oil has been found to effectively remove wear elements from the engine. The content of iron decreased by 2.5 times, aluminum by 1.5 times, copper by 5 times, and chromium by 3 times. It has been determined that cleaning the oil with ammonium hydroxide and carbamide flushes the engine more efficiently compared to cleaning with a mixture of isopropanol (3%) and mono-ethanolamine (3%). Researches of motor oils in friction units of combines were carried out in a comparative mode - in motor oil before installation of combines for storage and after storage for six months. It is concluded that it is expedient to replace oils before storage after summarizing the results obtained by determining the elements of wear products in motor oils that worked in the engines of combine harvesters, their precipitation during storage (idle time).

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