De-ices frozen fuel filters and re-liquifies gelled fuel. Prevents fuel filter icing and removes water from fuel system. Extends life of fuel filters, fuel-injection pumps and fuel injectors. Contains Slickdiesel Lubricator for maximum fuel lubrication which protects pumps and injectors from accelerated wear. Effective in all diesel fuels, including ULSD (Ultra Low Sulfur Diesel) and biodiesel blends containing up to 20% biodiesel (B-20).