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Keep your engine protected in extreme temperatures with Zerex G05 Phosphate Free Antifreeze Coolant Concentrate. Engineered with Hybrid Organic Acid Technology (HOAT), this premium coolant provides outstanding freeze and boil-over protection while preventing rust, corrosion, and scale buildup. Suitable for both gasoline and diesel engines, it offers long-lasting protection for radiators, water pumps, and all cooling system components.