Trucks with which model year of diesel engines must use Ultra Low Sulfur Diesel?

The correct answer is the model year 2007, as trucks with diesel engines manufactured in that year and later are required to use Ultra Low Sulfur Diesel (ULSD). This regulation was established to reduce harmful emissions from diesel engines, as ULSD contains significantly lower levels of sulfur compared to previous diesel fuels. Specifically, ULSD has a sulfur content of 15 parts per million (ppm) or less, in contrast to the older diesel fuels that could contain up to 500 ppm or more.

In 2007, stricter emissions standards were implemented by the Environmental Protection Agency (EPA), which mandated the use of ULSD in order to comply with those standards. This change was necessary to encourage the manufacturing of cleaner-burning diesel engines capable of meeting the new requirements aimed at improving air quality and public health. Therefore, trucks with model year 2007 diesel engines are specifically designed to operate on ULSD to achieve these emissions targets and contribute to reducing the environmental impact of diesel fuel combustion.

The years preceding 2007 had different requirements for sulfur content, which means that while trucks from 2005 and 2006 could use diesel with higher sulfur content, it was not mandatory for them to use ULSD, unlike trucks made from 200