Lubricants play a vital role in machine performance, machine life, reducing wear and friction, and preventing component failure. Poor performance of lubricant can cause significant energy and material losses. To improve the lubricating properties of bearing oil, nanoparticles can be added in bearing oils. In this research aluminum oxide (Al2O3) nanoparticles were added to the SN-500 base oil and tribological properties were examined. The concentrations of Al₂O₃ nanoparticles prepared in SN-500 base oil are0.1wt.%,0.5 wt. %, 0.75 wt. % and 1 wt. %. The trials of friction and wear were carried out on a pin on disc tribotester, withvaryingtheconcentration of nanoparticle and by varying load (10N, 30N & 50N). The obtained results were compared between Al2O3nanooilandSN-500 base oil. The results showed that 0.5wt% for Al2O3 nano fluid concentration was an optimum concentrationfor wear. Forthefriction reduction test, when Al2O3 nanoparticles were added into a base oil, the coefficient of friction reduced by 19%, 35%&52%at0.5 wt.% concentration as compared to oil without nanoparticles. Keywords: Nano metal powder, wear, friction, lubricants