Shell Rotella Ultra ELC coolant has been added to the Shell Rotella heavy-duty engine antifreeze/coolant product portfolio. The coolant can be used in diesel, gasoline and natural gas-powered engines, and it reduces cooling system maintenance. It also protects the cooling system by reducing water pump failures, hard-water scale deposits and silicate gel. Shell Rotella Ultra ELC is available in two formulations — a pre-diluted 50/50 and a concentrate.