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The disposal of the synthetic esters creates pollution and the depletion of the petroleum reserves is the issue of concern. The vegetable oil with application of nanoparticles are one of the feasible ways for providing an alternative. This study presents the tribological characteristics of Euphorbia Lathyris oil. In the initial phase, the oil was chemically modified through the epoxidation process and further addition of the zinc oxide (ZnO) nanoparticles was done. The nano lubricants were evaluated for the thermophysical characterization like viscosity, flash point, pour point with tribo analysis like friction behaviour, anti-wear mechanism, and worn surface examination using Scanning Electron Microscope. The test was performed by using a pin on disc tribometer for the tribological analysis. The viscosity of the oil shows increment with chemical modification and increase in addition to the nanoparticles. The maximum …