Shell ROTELLA? ELC Nitrite Free (NF) Pre-Diluted 50/50 antifreeze/coolant is an ethylene glycol-based coolant that contains the proven Shell ROTELLA? ELC OAT technology for extended life operation up to 1,200,000 miles in Class 8 over the road operation. Also, exceptional long life is expected for all other applications, such as diesel, gasoline, and natural gas engine powered vehicles along with light duty passenger cars and pick-up trucks with proper maintenance. Nitrite free formulation provides improved protection of aluminum components in modern engines including brazed aluminum heat exchangers and meets many of the newest OEM specifications. ROTELLA? ELC NF Pre-Diluted 50/50 is pre-diluted and ready to use. It requires no further dilution.