Professional composition for increased fuel system operation reliability of gasoline (carbureted and injected) engines. It is used to prevent formation of ice plugs in the fuel system of gasoline engines in winter. It additionally comprises cleaning additives which allow keeping the system clean. It neutralizes moisture. It ensures easy engine start in low temperatures. It prevents corrosion the fuel system parts. It is safe for any engines (including for turbocharged ones), oxygen sensors, catalytic convertors. It is recommended to use it at each second fueling for reliable car operation at large temperature fluctuations.