Is it ok to use -40 degree antifreeze in Heihe area?

Of course. The antifreeze with -40 degree can be used in Heihe area because its main functions are antifreeze, anti-boiling, anti-scaling and anti-corrosion. In the south, the lowest freezing point can reach -75 degrees, while in the northeast, the weather of -20 degrees in winter lasts for several days every year, so it is possible to use antifreeze of -40 degrees in Heihe.