The transit agency started using this fuel in 2004, prior to the widespread adoption of ultra-low sulfur diesel, which has since become the standard.

Currently, the vast majority of ultra-low sulfur diesel is produced from petroleum.

Visit the Alternative Fuels and Advanced Vehicles Data Center to learn more about ultra-low sulfur diesel.

Ultra-low sulfur diesel began to be restricted to a maximum 15 ppm in 2006 and refiners are to be 100% compliant with that level by 2010.

Consumers with 2007 or later model year diesel vehicles should only fuel them with ultra-low sulfur diesel (ULSD).

It is a combination of conventional ultra-low sulfur diesel and natural gas.

The most effective solution is to further refine fuel at the refinery to produce ultra-low sulfur diesel.

Hybrid and fuel efficient vehicles were used, with low sulfur diesel as their energy source.

At Elon, there are seven bio-buses that run on an alternative fuel made of 20% bio-fuel and 80% ultra low sulfur diesel.

Later US models went on sale in 2006, which was compliant with 50 states emission with Ultra-low sulfur diesel and particulate filter.