Diesel Ultra Low Sulphur Diesel


The U.S. Environmental Protection Agency (EPA) has issued new standards to improve air quality. To meet EPA standards, the petroleum industry is producing Ultra Low Sulfur Diesel (ULSD) fuel, a cleaner-burning diesel fuel containing a maximum 15 parts-per-million (ppm) sulfur.

Scientists have found that exposure to the soot and exhaust from diesel engines lead to environmental pollution, as well as the potential development and aggravation of health problems like lung cancer and asthma.


Since the early 1990s, the United States government has responded to these concerns by enacting a series of laws and rules designed to reduce diesel emissions:

In combination with cleaner-burning diesel engines and vehicles, ULSD fuel will help to improve air quality by significantly reducing emissions.

Older vehicles can still be fueled with higher-sulfur diesel, but diesel engines from 2007 and on must be fueled with ULSD because:

  • Using non-ULSD fuel will void your engine’s warranty.
  • It allows the parts and technology that control engine emissions to work.
  • It prevents the particulate trap from filling with sulfur and creating back pressure that could harm your engine.
  • It’s required by federal law.

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