Poly Organic Acid Technology (POAT) provides multi-year, extended service life and completely eliminates need for supplemental cooling additives to maintain superior cooling system performance. Protects cast iron, aluminum, steel, brass, copper and solder by passivating engine metals against corrosion and hard water scale while reducing leaks by sealing small surface fissures. Ensures maximum horsepower, performance and engine life. Propylene glycol formula is completely biodegradable and compatible with all conventional antifreezes.