SHELL Rotella Ultra ELC Extended Life 50/50 Antifreeze/Coolant is an extended life, ethylene glycol antifreeze for heavy duty diesel, gasoline and natural gas powered engines. Contains OAT corrosion inhibitor technology that provides effective corrosion protection of engine and cooling system metals. Free of nitrites, amines, borates and silicates. Suitable for heavy duty and light duty applications without supplemental coolant additives (SCA?s), making it ideal for use in mixed fleet applications. Premixed and ready to use. Requires no further dilution.