Unsurpassed freeze protection and anti-boil performance outperforms industry standards Phosphate additives safeguard against corrosion, scale and rust while protecting all cooling system metals (including aluminum) High-quality additives protect against leaks and won’t harm gaskets, hoses, plastics or original vehicle finish Pre-mixed green formula is ready-to-use in a 50/50 ratio with deionized water to protect all modern engine components from winter freezing (-34F) and summer boiling (265F). 5 year/150,000 mile guarantee protects against engine failure caused by freeze-ups or boil-overs Batch-tested in the lab, fleet-tested in the real world to help car and truck owners achieve optimal performance and maximize engine life. Contains 30 – 50 ppm of denatonium benzoate as a bittering agent