PEAK Concentrate Antifreeze + Coolant is a conventional (green), ethylene glycol based antifreeze for use in older automotive and light duty gasoline/diesel applications. PEAK Conventional Full Strength Antifreeze + Coolant provides maximum protection from freezing to -84 degrees F and boil-over to +276 degrees F. Protects all cooling systems, metals, including aluminum, against damaging rust and corrosion when used as recommended.