High-tech specialized composition to ensure performance of diesel engines at negative ambient temperatures. It is used for emergency treatment of frozen diesel fuel and restoration of fuel system performance. Ir de-freezes fuel in less than 30 minutes. It destroys and dissolves paraffin crystals in the fuel filter and fuel pipes. It is used with all types of diesel fuel, including bio-diesel. It does not cause corrosion and oxidation. It is absolutely safe for all parts of the fuel system: it does not comprise alcohols and chlorine-contained components.