Shell Rotella ELC Extended Life Coolant/Anti-Freeze is a fill for life ethylene glycol based coolant for heavy-duty diesel, gasoline and natural gas powered engines. Shell Rotella ELC contains a unique extended life carboxylate inhibitor system and nitrite / molybdate as secondary Shell Rotella ELC meets all the requirements of CAT EC-1, TMC RP 329 and RP 338. Shell Rotella ELC is available as a concentrate and as 50/50 and 60/40 volume mixtures of Shell Rotella ELC with deionized water.