Shell Zone Antifreeze and Engine Coolant Concentrate is specially formulated to meet the stringent aluminum corrosion protection requirements of todays automotive engines. Because of its low concentration of silicate, Shell Zone Antifreeze and Engine Coolant Concentrate also complies with Cummins and other heavy-duty diesel engine manufacturers silicate requirements. Shell Zone Antifreeze and Engine Coolant Concentrate is also suitable for use in industrial internal combustion engines where an antifreeze/coolant is required to provide protection against freezing, boil over, and corrosion.