Extended Life Coolant/Anti-Freeze is a "fill for life" Ethylene Glycol based coolant for heavy-duty diesel, gasoline and natural gas powered engines. Rotella ELC contains a unique extended life carboxylate inhibitor system and nitrite / molybdate as secondary inhibitors. It contains no silicate, borate, nitrate or phosphate and requires no traditional SCA additions. Meets the requirements of CAT EC-1, TMC RP 329 and TMC RP 338.