Effect of Soot on Friction and Wear Behavior of Engine Oils

Soot in engine oils is known to have a detrimental effect on the performance of engine oils. The current study offers a test methodology that could be used to investigate the extent of impact of soot. This was done through extended Stribeck tests and wear tests on a Modular Compact Rheometer (MCR) Tribometer from Anton Paar with a ball-on-three-pins test configuration.


Lubricants in an engine are designed to minimize friction and wear of components under relative motion. However, the combustion process taking place in an engine releases compounds that are detrimental to the efficiency of the system. These harmful components include metal oxide particles, acidic compounds, sludge, soot, etc. In the recent years, the staggering increase in the oil drain intervals has led to an increased concentration of these harmful elements in the oil. This puts additional burden on the engine oil.

This report presents a test methodology to determine the impact of soot on the friction behavior of the engine oil in the static and kinetic friction regimes of the Stribeck curve. Additionally, the effect of soot on the anti-wear protection of the engine oils is also presented.

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