Ultra-Low Sulfur Diesel
Consumers with 2007 or later model year diesel vehicles should only fuel them with ultra-low sulfur diesel (ULSD). ULSD is a cleaner-burning diesel fuel that contains 97% less sulfur than low-sulfur diesel (LSD). ULSD was developed to allow the use of improved pollution control devices that reduce diesel emissions more effectively but can be damaged by sulfur. It is also safe to use with older diesels.
Check the Label
As of December 1, 2010, all diesel fuel sold in the U.S. must be ULSD, and pumps dispensing ULSD must be labeled as such (except in California). Labels similar to those shown here can be found on the upper two-thirds of the pump.
Energy Basics: Ultra-Low Sulfur Diesel Fuel (DOE Office of Energy Efficiency and Renewable Energy)
What is Ultra Low Sulfur Diesel? (Alternative Fuels and Advanced Vehicles Data Center)
Ultra Low Sulfur Diesel is the primary highway diesel fuel produced. (Clean Diesel Fuel Alliance)
Ultra-Low Sulfur Diesel (Diesel Technology Forum)