Motor vehicle fuels in Mexico are distributed exclusively by the national oil company Petróleos Mexicanos (PEMEX). Regulation NOM-086-SEMARNAT-SENER-SCFI-2005 defines two grades of diesel fuel:
- Automotive diesel (PEMEX) for use in on-road vehicles, and
- Marine and agricultural diesel.
The low sulfur automotive diesel grade (first introduced as Diesel Sin) replaced the earlier standard diesel of 5000 ppm (0.5%) sulfur.
The regulation sets automotive diesel fuel sulfur levels at 500 ppm with a scheduled reduction to 15 ppm. The following is the phase-in schedule for ultra-low sulfur (15 ppm) on-road diesel:
- February 2007—Northern frontier region that borders the USA,
- February 2009—Metropolitan regions of Guadalajara, Monterrey and the Valle de México,
- September 2009—Nationwide.
Diesel fuel for marine and agricultural applications is colored and has an upper sulfur limit of 5000 ppm.