A disadvantage of diesel as a vehicle fuel in some climates, compared to gasoline or other petroleum derived fuels, is that its viscosity increases quickly as the fuel's temperature decreases, turning into a non-flowing gel at temperatures as high as -19 °C (-2.2 °F) or -15 °C (5 °F), which can't be pumped by regular fuel pumps. Special low temperature diesel contains additives that keep it in a more liquid state at lower temperatures, yet starting a diesel engine in very cold weather may still pose considerable difficulties.
大意是說:
柴油在低溫(-15 °C ~-19 °C)會變成膠狀(不是結冰喔)無法流動,所以燃油幫浦沒辦法把柴油抽上來送進引擎室,解決之道是加添加物讓柴油在此低溫時依然像液體狀態可以流動