Rotella ELC Antifreeze/Coolant Concentrate 1 Gal. (6 Pack) Minimum coolant life of 600,000 miles with only one Shell Rotella ELC Extender addition at 300,000 miles Improved water pump seal life due to low dissolved solid levels Excellent pitting protection for wet sleeve cylinder liners Excellent, long-term corrosion protection of all cooling system metals including aluminum, brass, cast iron, steel, solder, and copper No regular Supplemental Coolant Additives (SCAs) required