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Star brite Star-Cool Premium Synthetic PG Engine Coolant combines an essentially non-toxic propylene glycol base with unique poly organic additives (POAT) for multi-year, extended service life and eliminates the need for supplemental cooling additives. It is formulated to protect 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. The propylene glycol formula is completely biodegradable and compatible with all conventional antifreezes.