In screw compressor, the premature failure of rotor/roller contact has been observed intermittently in the industrial application. Therefore, the elliptical contact in screw compressor is investigated experimentally to study failure of tribo contacts. In pin-on-roller tribo-tester, the load capacity of lubricants is simulated by conducting experiments in controlled way to determine the cause of failure of rollers/rotors contacts. A plan of experiments based on Taguchi technique was used to acquire the data in a controlled way. The continuous presence of the lubricant film depends on the contact area, the load on the contact area, speed, operating temperature, surface finish, and the oil viscosity. Based on the results of the surface morphology, it has been suggested that the test specimens have great possibility to exhibit higher friction and higher wear. This implies that the thin lubricating film formed due to the inadequate hydrodynamic action. To mitigate the problem of wear and friction in the rotor contact, commercial oil has been used without additive and Tribo-performance results are reported.