The present paper is based on the influence of addition of carbon coated nickel nanoparticle and silicon oxide nanoparticle and their combinations on the tribologi cal behavior of engine oil. Samples were prepared of varying percentage of nanoparticles in engine oil (0.5, 1 and 2 wt %). The wear test was conducted using four ball tribotester according to ASTM standard 4172b, viscosity, flash and fire point was evalua ted using redwood viscometer and flash and fire point apparatus. The

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... al results shows that both nanoparticles as additives in engine oil at various mixing percentage have better antiwear properties than the pure engine oil. Also viscosity, flash and fire point of nanoparticles with different concentrations gives an effective functionality of engine oil.