Coolant/anti-freeze is a “fill for life” ethylene glycol based coolant for heavy-duty diesel, gasoline and natural gas powered engines. The inhibitors due to their special chemistry, are designed to go 600,000 miles on-road or 12,000 hours off-road with only one addition at 300,000 miles or 6,000 hours. Shell ROTELLA® ELC’s patented inhibitors, while providing complete cooling system component protection, also help reduce water pump failures, hard water scale deposits, silicate “green goo” and improve heat transfer.