Authors: B.I. Kowalski, D.V. Agrovichenko, Sokolnikov , V.A. Balyasnikov

Title of the article: The study of influence of topping on thermal oxidation stability indicators of Lukoil standard 10w-40 sf/cc mineral engine oil

Year: 2017, Issue: 5, Pages: 168-174

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.892.2

DOI: 10.26730/1999-4125-2017-5-168-174

Abstract: In determining the quality of the engine oil in use, the influence of topping becomes very important for the mechanism of thermal oxidation. However, the influence of topping on the condition of engine oils is not studied sufficiently. The objective of these experimental studies is to determine the effect of topping on thermal oxidation stability and relative viscosity of mineral motor oil 10W-40 SF/CC, as well as determination of the light flux absorption coefficient, evaporation, coefficients of thermal oxidation stability and coefficient of relative viscosity. As criterion of an estimation of influence of topping on the oxidation and evaporation processes, the potential service life was proposed that is defined by the time the coefficient of thermal oxidation stability reaches the set value. The methodology of the study was to test the investigated oil in the device for thermostatic control in a sequence at temperatures of 180, 170 and 160 °C without topping and with topping, and the mass of topped-up oil corresponded to the mass evaporated. As a result, it was established that toppings had a significant impact on thermal-oxidation stability of mineral motor oil 10W-40 SF/CC and their influence increased with decreasing test temperature. At the same time, influence of topping on coefficient of relative oil viscosity at all temperature intervals of the test was inconsiderable.

Key words: light flux absorption coefficient evaporability coefficient of thermal oxidation stability potential service life coefficient of relative viscosity

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