Pro Blend 4032 Coolant Additive, 40 Below, 32 fluid oz., Each.  Pro Blend's 40 Below coolant additive reduces coolant temperatures up to 40 degrees. For use in circle track, drag race, street rods, cars, trucks, vans, and SUV's. The 40 Below additive prevents coolant temperatures from rising excessively while vehicle is towing, climbing, sitting in traffic, or running with restricted air flow. Pro Blend originally developed the 40 Below additive for NASCAR (R) race cars that run under the most severe heat conditions. In most applications, this additive maintains coolant temperature between 180-210 degrees F when one 30 oz. can is added to a mixture of 80 percent distilled water/20 percent ethylene glycol (antifreeze).