GUARD Anti Rust & Anti Freeze Coolant Heavy Duty (Red)

Guard Anti Freeze and Anti Rust Coolants are formulated with unique organic acids that form a protective layer that prevents corrosion on metal components. Independent tests reveal it greatly surpasses standards for metallic corrosion and erosion, achieving nearly perfect scores in ASTM corrosion and erosion testing on cast aluminum cylinder heads, steel, copper, solder, brass and cast iron and aluminum water pumps.