Ultra-Low Sulfur Diesel

Under Environmental Protection Agency’s (EPA) requirements, in 2006 there was a significant reduction of sulfur in diesel fuel. Burning sulfur contributes to air pollution. One of the greatest contributors to particulate matter (soot) emissions is the sulfur content in diesel. Ultra-low sulfur diesel (ULSD) contains a maximum of 15 parts-per-million (ppm) of sulfur, as compared to low sulfur diesel that allows up to 500 ppm of sulfur. Model year 2007 and later diesel engines require ULSD. These engines are designed with advanced emission systems to burn cleaner and pollute less. Fueling with higher sulfur diesel will damage a vehicle’s more advanced catalysts and filters, voiding the engine warranty. ULSD is compatible with pre-2007 model vehicles. The disadvantage is that older diesel engines do not have the advanced emission systems to take full advantage of polluting less.