1/2 Gallon, Diesel Treat, Lowers The Cold Filter Plugging Point Of Your Base Fuel An Average Of 20 Degree, Provides Superior Cold Weather Protection & Is Safe & Effective In All Diesel & Biodiesel Blends To B-20, Prevents Fuel From Gelling, Increases Power & Fuel Economy, Guaranteed To Prevent Gelling Or Pays The Tow.