Abstract
The effects of gear oil viscosity and friction reducer type on transmission efficiency have been investigated using the manual transmission and hypoid rear axle of a typical Japanese car. A reduction in the viscosity of the oil improved the efficiency of the manual transmission but led to positive and negative effects in the rear axle, depending upon operating conditions. The effect of the friction reducer varied according to the type of EP additive used, indicating the necessity of preliminary investigations of compatibility with EP additives before adding friction reducers to gear oils.
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