Water contamination of motor oils during storage and use in low-temperature conditions cause formation of deposits. These deposits, which consist of asphaltenes and additives, characterize the colloidal stability of the oils. A decrease in the concentration of additives worsens the performance properties of the motor oils..In 1955, Anglo-American engineers turned their attention to the greasy black sediments in the lubricating systems of internal combustion engines for the first time [1,2]. Five years later, Soviet scientists also showed an interest in these formations [3]. All investigators agreed that the presence of water in the motor oil is the basic cause of the deposits. Such deposits can also be found on the bottom of motor oil storage tanks. The presence of water in oil is determined in laboratory conditions using special equipment in the first case and visually during cleaning of oil tanks in the second case.How does water affect the state of motor oils and what are the consequences?The additives it contains play the paramount role in ensuring the performance of motor oils. The effect of water on the state of motor oils was investigated with a specially developed method using fresh motor oils of guaranteed quality: M-8V (GOST 10541-78) and Turbo-1 M-8D(m) (TU 38.30119110-97).The method of investigation provided for: forced introduction of 0.5, 5, 10, and 15% water in samples of motor oils; careful mixing; resting for 72 h; visual observation for the state of the oils; emission spectral analysis of the top layer of the sample on a MFS-7 unit for recording the content of elements -additive indicators.After introduction of the water, stirring, and holding, the liquids stratified with formation of sediment. The height of the sediment layer was a function of the water content in the mixture and the concentration of additives in the oil. The additives were salts of organic acids and different metals.The change in the content of ash additives can be judged by the change in the concentration of metals in the oil, determined in spectral analysis. The results of spectral analysis of the top layer of the water-contaminated oils are shown in Fig. 1.
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