Ultra1Plus UltraCool Universal Antifreeze + Coolant 50/50 PREMIXED (Green) is a premium, ethylene glycol antifreeze + coolant for heavy-duty diesel, gasoline, and natural gas-powered engines that protects your complete cooling system all year-round. It can be used in both aluminum and conventional metal engine cooling systems of heavy-duty diesel engines, automobiles, trucks, marine and industrial stationary equipment. Formulated with deionized water, a low silicate rust and a corrosion inhibiter system that effectively alleviates gel formation problems and prevents radiator heat transfer capacity loss. Ultra1Plus UltraCool Universal Antifreeze + Coolant 50/50 PREMIXED (Green) is formulated to meet today's automotive engines stringent aluminum corrosion protection requirements due to its low silicate concentration. Meets the low limits of GM 6038M.