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During the last years several electronically controllable automotive transmission systems, where wet clutches are used as intelligent differentials, have been developed. These applications generally apply high stress on the transmission fluids. The fluids must preserve the desired frictional characteristics at different torque level in an environment where the ambient and system temperature varies over a wide range. This paper is focused on limited-slip wet clutches in all-wheel-drive systems. Different approaches for transmission fluid development are described. Data from thermal analysis and friction measurements are used to illustrate the influence of system related parameters on frictional characteristics. The friction characteristics resulting from temperature changes on the surface of the lamella material is presented.