One of life’s lesser pleasures is watching your car’s temperature gauge soar while you sit in summer traffic. However, help is on the way in the form of a coolant additive called Stops Overheating. It makes your coolant a better heat conductor and will reduce water temperatures by as much as 40 degrees when towing, climbing or sitting in traffic. The additive was originally developed for NASCAR race cars that run under the most severe heat conditions. NOTE: Shipping to Continental United States Only. No P.O. Boxes. Ground Ship Only.