Red Line 80213 Diesel Water Wetter - 15 Ounce, (Pack of 12) Doubles the wetting ability of water. Improves heat transfer and reduces cylinder head temperatures. Cleans and lubricates water pump seals May allow more spark advance for increased torque. Prevents foaming Designed for Heavy Duty Diesel Equipment and Machinery enginges where only the Heat Transfer Benefits are required because it is added in addition to another manufactureer's rust inhibitor or antifreeze.