Motor bearings are subjected to high radial and low axial loads, but the loads can fluctuate due to the frequent start-up and shutdown depending its operation. Due to its intermittent operation, the friction zones in the motor bearing will constantly shift. With each on/off cycle, the motor starts from zero and reaches its rated speed. As a result, the friction partners experience maximum friction during boundary lubrication and move into the low-friction hydrodynamic zone. High temperatures and extreme vibration are other operational variables that grease must deal with. The grease releases some oil to create the required lubricating film between the friction surfaces. The intense heat generated during the boundary and mixed friction zone can cause the base oil to evaporate and the base oil viscosity to drop. The process continues for the designed life of the grease and the specified relubrication interval. However, in some cases, if the sealing is not effective, the bearings are exposed to external anomalies such as excessive dust, heat, water or corrosive process environment, etc. Also, when the motor is stopped unplanned for long periods of time, the oxidation process accelerates. Bearing metal act as catalysts for the external dust influence, operating temperature, wear particles and the oxidation process. The end result of this oxidation process during prolonged stopping can lead to hardening of the grease or ‘hard cake-like formation’, which can damage bearing life.