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The efficiency of engine oils usage depends to a great extent on stability of their service properties during operation in combustion engines. This requires that stability of their physical and chemical properties to be provided during the operation. It is well known that the change of oil properties during operation of combustion engines is a complicated tribological and chemical process accompanied by accumulation of wear debries products of partial oxidation of oils and fuels, decomposition of additives, accumulation of products of interaction between additives and oils, mechanical impurities, tar sediments, oxidation products of oils and sulfur components of diesel fuels, oil burning, etc.