The issues of cleaning the engine lubrication system from pollution by used engine oils without draining them from the crankcase are considered. It has been established that adding monoethanolamine mixed with isopropanol to the engine oil that worked in the engine allows the resins and oxidation products dissolved in the oil to be enlarged to sizes that are easily removed by cleaning agents built into the lubrication system. It was determined that the subsequent addition of dimethyl sulfoxide and white spirit to the oil gives the oil high cleaning properties. According to the results of comparative tests, it was found that the contamination of engine parts after washing the lubrication system with commercial washing oil is reduced by half. Using the developed washing process allows to reduce the contamination of the main parts by 4 times. Compression in the cylinders after washing the D-240 engine according to the developed method increased from 2 to 2,5 MPa, fuel consumption decreased from 13,9 to 11,3 l/h. The content of insoluble sediment in the oil after washing the engine with the developed method was 0,65 %, while in a special washing oil it was 0,37 %. These facts confirm the high washing properties of the composition. In general, the developed flushing technological process allows, under the conditions of agricul-tural enterprises, to clean the lubrication system and engine parts from pollution without the use of expen-sive flushing oils. Cleaning of engine parts from pollution increases the service life of equipment and reduces the cost of repair and maintenance of worn-out agricultural machinery.