FIELD: transportation.
SUBSTANCE: invention relates to vehicles. Vehicle drive system comprises an engine having a first oil; a transmission having a second oil, and a heat exchanger exchanging heat between the first oil and the second oil. Absolute value of the decrease in the moment of losses in the transmission by a single value of the decrease in the kinetic viscosity of the second oil exceeds the absolute value of the magnitude of the increase in the moment of losses in the engine by a single value of the increase in the kinetic viscosity of the first oil.
EFFECT: decision is aimed at reducing the total loss of the engine and transmission.
11 cl, 33 dwg
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