Heet Diesel Winter Treatment lubricates and protects delicate fuel system components while cleaning and protecting your fuel injectors. Gives a Cetane boost for a faster start and better mileage while reducing Cold Filter Plug Point (CFPP) by up to 36 degrees Fahrenheit. One 12 ounce bottle treats up to 35 gallons of fuel and prevents gelling to minus 40 degrees Fahrenheit. Made in USA.