12x1 Quart Diesel Fuel Stabilizer. FUEL GUARD is an unparalleled fuel conditioner that responds to an entirely new set of demands created by new low sulfur fuels, as well as satisfying the needs of previous fuel related problems. FUEL GUARD not only helps to stabilize the fuel, but also increases engine life and power, by keeping the internal parts of the engine cleaner, aiding combustion, neutralizing acids and holding carbon, varnish and gum in suspension. This suppresses the tendencies of icing and corrosion. Use for trucking, heavy construction, agriculture, mining equipment, industrial equipment, marine and fuel storage applications.