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This paper presents investigations related to the combined influences of viscous heat dissipation and non-Newtonian rheology of lubricant on the performance parameters of micro-textured journal bearing. The model proposed herein is solved using finite difference technique by incorporating mass conservation algorithm (JFO boundary conditions) and oil mixing temperature concepts. Some results have been also presented with Reynolds boundary conditions (RBC) for comparison point of view. Based on the present numerical investigations, it is found that JFO boundary conditions yield realistic results in comparison to RBC. Moreover, JFO boundary condition provides numerical stability in getting the converged results with micro-textured surfaces of journal bearing. Reductions in average temperature of the lubricant have been noticed in presence of surface texturing in comparison to smooth surface of the bearing.