Abstract
This paper presents the results of a study undertaken to investigate the thermal oxidative stability of the Mobil 10W-40SC/CC mineral engine oil at temperatures of 170, 180 and 190 °С. The research technique involved the use of the following controls and tests: a device for oil thermostatting; a photometer for a direct photometry of oxidised oils; electronic scales for determining the mass of the oil evaporated during thermostatting. According to the obtained results, graphical dependences of the optical density D, evaporability G and coefficient of thermo-oxidative destruction P TOD on the experimental time and temperature were built. A method for calculating the coefficients of thermal-oxidative degradation at the temperature of 190 °С using the data obtained at temperatures of 170 and 180 °С has been validated. A comparative analysis of experimental and calculated data was carried out, with the relative error being calculated. It is established that the application of the proposed analytical model not only reduces the research complexity involved with determination of thermo-oxidative stability coefficients, but also allows directions for improving measurement and testing tools to be specified.
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