Prestone(R) Command(R) Nitrited (NOAT) Extended Life (ELC) antifreeze+coolant (Concentrate) is designed to work with all Class 6-8 vehicles. When compared to ESI & low silicate conventional, it is designed to help lower maintenance costs and improve water pump life. It is compatible with any Nitrited OAT engine. This formula is Nitrited and provides excellent protection for aluminum and all other engine metals. Command NOAT ELC protects against liner pitting and corrosion protections.