在冬季不管汽油车、柴油车，发动机都不容易起动。其主要原因有：１由于受外界气温的影响，润滑油黏度增大甚至凝结，润滑油流动性变差，使发动机起动时阻力增大，难以达到起动所需要的最低转速。２燃油也受气温的影响，黏度增大，蒸发性能变差，雾化不良，使发动机起动转速低 In winter, regardless of gasoline vehicles, diesel vehicles, the engine is not easy to start. The main reasons are: 1 due to the influence of outside temperature, the viscosity of the lubricating oil increases or even condenses, the fluidity of the lubricating oil deteriorates, so that the engine starts to increase the resistance and it is difficult to achieve the minimum speed required for starting. 2 fuel is also affected by the temperature, viscosity increases, poor evaporation, poor atomization, the engine starting speed low