Three grease type OGLs were formulated utilizing three types of base oils: mineral, PAO and UPP with an additive pack containing components for extreme pressure, antiwear and corrosion. The base oils that had kinematic viscosities around 2000 cSt at 40°C but had different kinematic viscosity index results. Because the UPP OGL had the highest kinematic viscosity index, it was thought that it would have beneficial properties at elevated temperatures compared to the other two OGLs. It appeared that the UPP based OGL did provide some additional antiwear performance. The three OGLs were then evaluated in the FZG A/2.8/50 which could be more easily correlated to real life applications in the field. This testing illustrated that the UPP OGL did provide a thermal benefit; in that it allowed for the test rig to operate at a temperature 21°C cooler compared to the mineral OGL. The FZG testing also demonstrated that the UPP OGL consumed 20 percent less energy when compared to the Mineral OGL on the same stand under the same operating conditions. The benefits of UPPs have also translated to top tier performance in the field. This has been demonstrated by the excellent load carry and antiwear capabilities of the UPP OGL used in the steel manufacturing field trial.