TRUEGARD Red 50/50 Antifreeze/Coolant is a "Fill for Life" carboxylate Based Coolant for Heavy Duty Diesel, Gasoline and Natural gas Powered Engines. It Contains Ethylene Glycol and Nitrite and molybdate as secondary Inhibitors. This Product Requires no traditional SCA additions and Contains no silicate, Borate, nitrate or Phosphate. TRUEGARD Red 50/50 Coolant Meets all the Requirements of CAT EC-1, TMC RP 329 and RP 338.