Red Line Water WetterWATERWETTER 12OZ Unique agent for cooling systems that doubles the wetting ability of water Rust and corrosion protection allows for use of straight water in racing or reduced antifreeze levels in warm climates Improves heat transfer and reduces cylinder head temperature Use one bottle for most passenger cars and light trucks, treats 3 to 5 gallons or 13. 2 to 15. 9 liters, vehicles with larger cooling systems should use two bottles, small cooling