Simmondsia chinensis or jojoba oil has been modified via esterification, hydroxylation, and transesterification process. The modified jojoba oil has been blended with SAE20W40 oil in the ratio of 0, 10, 20, 30, and 40 by vol %. Graphene nanoparticles were added to the blended oil in 0.05, 0.075, and 0.1wt%. Wear and friction characteristics were evaluated for sliding speed ranging from 1 m/s to 5 m/s under the load of 50 N, 100 N, and 150 N with pin-on-disc tribometer, and surface analysis technique was used to study surface morphology of pin. Tribological results firmed that 20% of modified jojoba oil with 0.075wt% of graphene can be probable feed stock for SAE20E40 oil.