1 GALLON ENGINE ANTIFREEZE/COOLANT: Fully compatible with other extended life antifreeze/coolants. This item contains a bittering agent called Denatonium Benzoate. PROTECTS: Advanced formulation prevents rust & corrosion protecting all cooling system components DESIGNED FOR EUROPEAN VEHICLES: Recommended for use with certain years of Audi, Mercedes, Porsche, VW, and other European vehicles that require a VIOLET silicate-enhanced organic acid technology (Si-OAT) formula GUARANTEED: When installed as part of a complete flush and fill, PEAK guarantees this coolant will provide service life protection up to 150,000 miles or 5 years. CONCENTRATED FORMULA: Ideal for flushing, filling, or topping off your cooling system PEAK Original Equipment Technology Extended Life Violet Concentrate Antifreeze + Coolant for European vehicles is a line of premium coolants specifically designed to match the technology and color requirements of European vehicles and is formulated with the same corrosion inhibitor technology that protected your vehicle straight from the factory. PEAK OET European Violet Extended Life Antifreeze + Coolant formula is based on proprietary silicate-enhanced organic acid technology (Si-OAT), and is specifically designed to provide protection of your vehicle’s engine cooling system metals against damaging rust and corrosion. It is compatible with other violet Si-OAT formulations and is perfect for flushing, filling, or topping off your cooling system. This item contains a bittering agent called Denatonium Benzoate. This 1 gallon bottle is recommended for use with European cars and trucks requiring an violet Si-OAT formula, including: Audi vehicles 2007 & newer, Mercedes-Benz vehicles 2014 & newer, Porsche vehicles 2010 & newer, VW vehicles 2008 & newer, and other European vehicles requiring a violet Si-OAT coolant formulation. When installed as part of a complete flush and coolant fill, PEAK guarantees this coolant will provide service life protection of up to 150,000 miles or 5 years