Chiang Mai Journal of Science

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The present paper reports experimental results from atomic absorption spectrometric (AAS) determination of metallic elements in used automotive lubricating oils, carried out to evaluate the effect of long-term durability tests using crude palm oils (CPO) and diesel blends on engine wear characteristics. Fresh as well as used lubricating oils were analyzed for Fe, Cu, Cr, Al, Pb, Sn and Ni. The results obtained showed similar patterns between each CPO/diesel blend that wear metals debris increased with running time but at decreasing rate. Attrition of metallic elements tends to slow down as the engine ages. The rate of change of metal content was high in the first 5000 km but it was decreased to lower value as the running distance increased. An increase in these metal contents may be quantitatively used as an indicator for wear. It should be noted that CPO/diesel blend appeared to have less amount of wear metals debris than that from diesel.

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