Dex-Cool Premix. ACDelco Dex-Cool® Pre-diluted Antifreeze / Coolant uses a patented carboxylate inhibitor technology to provide protection of the six basic metal alloys found in most heat transfer systems. Do not add water. Includes: Formula suits both automotive and heavy-duty diesel engines. Provides corrosion protection for aluminum, brass, copper, solder, steel and cast iron. Biodegradable in its pure unused form. Formulated with anti-foam characteristics, aluminum corrosion protection and heat transfer properties. Compatible with cooling system filters and most major brands of coolant. Mixes readily with clean tap water. *By request/order.