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Journal of Analytical Methods in Chemistry
Volume 2012, Article ID 819524, 8 pages
Research Article

Monitoring of the Physical and Chemical Properties of a Gasoline Engine Oil during Its Usage

1Department of Chemistry, Shahreza Branch, Islamic Azad University, Isfahan, Shasreza 86145-311, Iran
2Department of Chemistry, Faculty of Sciences, University of Shahrekord, Shahrekord 88186-34141, Iran
3R&D Unit, Barzin Sepand Sepahan Company, Dehagh Industrial City, Isfahan 19615-134, Iran
4Quality Control Unit, Sepahan Oil Company, Isfahan 15119-15513, Iran

Received 7 November 2011; Revised 23 January 2012; Accepted 24 January 2012

Academic Editor: FakhrEldin O. Suliman

Copyright © 2012 Behnam Rahimi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Physicochemical properties of a mineral-based gasoline engine oil have been monitored at 0, 500, 1000, 2000, 3500, 6000, 8500, and 11500 kilometer of operation. Tracing has been performed by inductively coupled plasma and some other techniques. At each series of measurements, the concentrations of twenty four elements as well as physical properties such as: viscosity at 40 and 100°C; viscosity index; flash point; pour point; specific gravity; color; total acid and base numbers; water content have been determined. The results are indicative of the decreasing trend in concentration of additive elements and increasing in concentration for wear elements. Different trends have been observed for various physical properties. The possible reasons for variations in physical and chemical properties have been discussed.