1. The water temperature is low. On the one hand, due to excessive heat loss, the heat converted into useful work is reduced. On the other hand, due to the contact between the mixture and the cold cylinder wall, the vaporized fuel in the mixture condenses and flows into the crankcase, which not only increases fuel consumption, but also makes the oil thinner and affects lubrication. As a result, the engine power will decrease and wear will increase. 2. Automobile engines are afraid of both heat and cold. If the temperature of cooling water is too low, fuel combustion will deteriorate, fuel consumption will increase, wear will increase, and oil viscosity will increase
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