Shell ROTELLA? ELC Nitrite Free (NF) Pre-Diluted 60/40 antifreeze/coolant is based on proven Shell ROTELLA? ELC OAT technology for extended life operation up to 600,000 miles/12,000 hours in medium and heavy duty diesel, gasoline, and natural gas vehicles and up to 150,000 miles in passenger cars and light duty trucks. Nitrite free formulation provides improved protection of aluminium components in modern engines including brazed aluminium heat exchangers and meets many of the newest OEM specifications. Shell ROTELLA? ELC NF Pre-Diluted 60/40 is pre-diluted and ready to use. It requires no further dilution.