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

Title of the article: Graphic-analytical method for determination of thermal oxidation stability of Rosneft maximum 10w-40 engine oil

Year: 2017, Issue: 5, Pages: 175-182

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.892.2

DOI: 10.26730/1999-4125-2017-5-175-182

Abstract: Bench and field tests of engine oils for internal combustion engines are conducted to clarify the choice of lubricant, carried out by the characteristics given in the literature, and also by viscosity grades and groups of operational properties according to API classification, and requires considerable work. Therefore, to reduce the complexity and justification of the requirements to motor oils by thermal and mechanical stresses, it is required to find new methods of getting more information about their quality and to introduce new indicators. The aim of this work is to develop a graphic analytical method of determining the quality of engine oils in a wide temperature range. For the study, a semi-synthetic engine oil Rosneft Max 10W-40 SL/CF was chosen. Methodology of the study included testing of motor oil at three temperatures 180, 170 and 160° C. After every 8 hours of testing, a sample of the oxidized oil was weighed to determine the mass of evaporated oil. Then, part of the sample was taken for direct photometry and determination of the optical density, and another part of the oxidized sample was used to determine the kinematic viscosity. The result of the study is the graphic analytical model proposed for determination of the indicators of oxidative stability in a wide temperature range. The in-formation obtained will allow to compare different oils by the potential resource, the critical temperatures of oxidation and evaporation and temperature changes in the lubricant, and to identify compliance groups, operational properties according to API classification.

Key words: thermal oxidation stability optical density evaporability graphic analytical method of calculation of thermal oxidation stability indicators potential resource

CITE DOWNLOAD