1.combination function of cooling,frostproof ,anti-freezer,corrosion resistant ,dirt resistance 2protect the engine in cold day ... 1.combination function of cooling,frostproof ,anti-freezer,corrosion resistant ,dirt resistance2.protect the engine in cold weather3 ... can keep well the heat release of various engines cooling system .4.solidation point is at -50 °c,-45°c,-35 ...