The Prestone Command Heavy Duty Nitrite Free Extended Life Antifreeze/Coolant offers protection for aluminum and all other engine metals and complete liner pitting and corrosion protection. This product is available in both concentrate and prediluted 50/50. Its patented, technologically advanced formulation is based on a concentrated blend of premium long-lasting inhibitors designed to provide up to 600,000 miles or up to 12,000 hours of protection against temperature extremes, rust, corrosion, scaleand premature water pump failure. This product is CAT EC-1 compatible with any heavy duty engine.