This 12‑ounce bottle of Water Wetter super coolant additive enhances your cooling system by improving water's ability to spread heat across engine surfaces—lowering operating temperatures up to 20 °F. In warm climates or racing environments, it provides rust and corrosion protection that allows reduced antifreeze mixtures or even straight water use. Compatible with all types of glycol-based antifreeze, it meets rigorous ASTM corrosion standards. Easy to use, one bottle treats most automotive systems; larger systems can use two bottles. Ideal for all metal engine types and oxygenated fuel systems.