Diesel Vehicles
Advanced diesel vehicles fueled by ultra-low sulfur diesel are among the most fuel-efficient vehicles available today. Collaboration among the U.S. Department of Energy (DOE), the U.S. Environmental Protection Agency, industry, and the national laboratories has improved engine efficiency, reduced emissions, and mandated the level of sulfur (15 parts per million) in diesel fuel to keep engine emission control technologies effective. Most diesel vehicles also can run on biodiesel blends without engine modification.
The annual Directions in Engine-Efficiency and Emissions Research (DEER) Conference and the Advanced Combustion Engines Progress Report highlight diesel engine R&D funded by DOE and industry.
Diesel Vehicle Classes 
Learn about light-, medium-, and heavy-duty diesel vehicles.
Light-Duty Diesel Vehicle Availability
Find out which light-duty diesel vehicles are available in the United States.
Diesel Emissions
Learn about current and upcoming emissions regulations and technologies.
Selective Catalytic Reduction
Learn how diesel vehicles are becoming cleaner using selective catalytic reduction (SCR) and how Diesel Exhaust Fluid is used in SCR systems.
NOx Adsorbers
Learn how NOx adsorbers reduce nitrogen oxides emissions in diesel vehicles.