Exhibit 23.8
DEGOLYERAND MACNAUGHTON
5001 SPRING VALLEY ROAD
SUITE 800 EAST
DALLAS, TEXAS 75244
July 26, 2011
Dr. Juan José Súarez Coppel
Director General
Petróleos Mexicanos
Avenida Marina Nacional No. 329
Colonia Petróleos Mexicanos
Torre Ejecutiva, Piso 41
11311 Mexico, D.F. Mexico
Dear Dr. Súarez Coppel:
We hereby consent to (a) all references to DeGolyer and MacNaughton as set forth under the heading “Experts” in this Registration Statement on Form F-4 filed by Petróleos Mexicanos (the “Form F-4”), (b) all references to DeGolyer and MacNaughton as set forth under the headings “Presentation of Information Concerning Reserves” and “Business Overview” under the subheadings “Overview by Business Segment,” “Exploration and Production,” and “Reserves” in the Annual Report on Form 20-F of Petróleos Mexicanos for the year ended December 31, 2010 (the “Form-20-F”) incorporated in the Form F-4 by reference, and (c) the incorporation by reference in the Form F-4 of our report dated February 11, 2011, describing our review of the estimates of proved oil, condensate, natural gas, and oil equivalent reserves owned by the United Mexican States (“Mexico”) as of January 1, 2011, for 68 fields located offshore of Mexico in the Southwest Marine Region, which report was originally filed as Exhibit 10.6 to the Form 20-F. The estimates included in our report were prepared in accordance with the reserves definitions of Rules 4-10(a) (1)-(32) of Regulation S-X of the United States Securities and Exchange Commission.
| Very truly yours, |
| /s/ DeGOLYER and MacNAUGHTON |
| DeGOLYER and MacNAUGHTON |
| Texas Registered Engineering Firm F-716 |