All on-highway heavy-duty diesel vehicles manufactured in model year 2007 and later will be required to use S15 (ULSD) - See FAQ "Why is S15 (ULSD) required?" These vehicles will be forbidden to use diesel fuel with sulfur content greater than 15 ppm (parts per million). Some 2007 light-duty and passenger car vehicles will also require S15 (ULSD).
Vehicles not specifically designed for use with S15 (ULSD) may use either S15 (ULSD) or S500 (500 ppm) diesel.