Unique agent for refrigeration systems that doubles the humidification capacity of the water. Rust and corrosion protection allows for the use of pure water in racing or reduced levels of antifreeze in hot weather. Improves heat transfer and reduces cylinder head temperature. Use one bottle for most passenger cars and light trucks, treats 3-5 gallons or 13.2-15.9 liters, vehicles with larger cooling systems should use two bottles, small cooling systems should use 1 oz (3 to 4 capfuls) per quart Compatible with new or used antifreeze (including DEX-COOL® and long life versions) to improve heat transfer from ethylene glycol and propylene glycol systems. Satisfies ASTM D2570 and ASTM D1384 corrosion tests for glycol-based antifreeze. Does not contain ethylene glycol.