Hi! Hear in Finland large proportion of people driving winter with diesel engined cars. Temperature could be under -25°C to -30°C three months. Here is selled special winter diesel, Where is taken out from stearic. Stearic is used to solidify in filter and fuel lines. Many use cover in front of the radiator to protect against cold wind and lifting up engine temperature. Some use to change higher temperature thermostat range 88°C - 92°C. Nowadays in new cars is installed additional heater. EberspÃ¤cher , Webasto ETC... Which heats also when driving. Almost every car is equipped with electirical water heater. Which helps and protecs on cold start. Without nothing of mentioned, engine will run too cold. In the long run that causes bad worn in engine. Cheers!