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Research Article | Open Access

Motor oil degradation during urban cycle road tests

Lei WEI1,2, Haitao DUAN1, Yongliang JIN1, Dan JIA1, Bingxue CHENG1,3, Jianfang LIU1,4, Jian LI1( )
State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan 430030, China
College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
College of Biological and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China
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Abstract

Several civilian vehicles in China operate in urban traffic conditions and have their motor oil changed every 5,000 km. This study investigates the variations in oil properties after servicing at 5,000 km, based on systematic road tests (including a repeated test, a parallel test, and a new vehicle test). The physicochemical properties, changes in components, oxidation stability, detergent-dispersant performance, and tribological properties of motor oils were analyzed. The results showed that the total acid number (TAN) of oils increased with the operation mileage, by up to 1.41 mgKOH/g. The total base number (TBN) decreased after the road tests were completed, and the decrease was less than 44.6%. The kinematic viscosity (KV) of most oils decreased initially and then stabilized in the middle stage, before starting to increase later in the experiment. The change in KV at 100 ℃ was less than 15.96%. The oxidation onset temperature (OOT) of the oils diminished gradually with the operation mileage. All OOT values of the used oils were higher than 210 ℃. A spot test indicated that the used oils retained their detergent-dispersant performance to an appropriate extent. The four-ball wear scar diameters and friction coefficient of the used oils did not increase significantly after the road tests were completed. This study can serve as a reference for end-users when changing motor oils.

Keywords

motor oilurban vehiclesoil degradationroad testoil analysis

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Friction
Volume 9 Issue 5,
October 2021
Pages 1002-1011
DOI: 10.1007/s40544-020-0386-z
Cite this article:
WEI L, DUAN H, JIN Y, et al. Motor oil degradation during urban cycle road tests. Friction, 2021, 9(5): 1002-1011. https://doi.org/10.1007/s40544-020-0386-z

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Received: 26 November 2018
Revised: 24 January 2019
Accepted: 18 March 2020
Published: 26 August 2020
© The author(s) 2020
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