Description Durex Heavy Duty SCA Precharged Antifreeze / Coolant Full Strength is a premium quality, virgin ethylene glycol-based coolant prechared with Supplemental Codant Additives (SCAs). This precut is designed for use in heavy duty cooling systems applications and will provide protection against freezing, boil-over, cavitation erosion, corrosion, scale and flaming without SCAs at the initial fill. Provides up to 6,000 hours or 300,000 miles of protection.