Exhibit 23.8 (1 of 2)
DeGolyer and MacNaughton
5001 Spring Valley Road
Suite 800 East
Dallas, Texas 75244
September 19, 2017
Dr. José Antonio González Anaya
Director General
Petróleos Mexicanos
Avenida Marina Nacional No. 329
Torre Ejecutiva, Piso 44
Colonia Verónica Anzures
11300 Ciudad de México, México
Dear Dr. González Anaya:
We hereby consent to (a) all references to DeGolyer and MacNaughton as set forth under the headings “Experts” and “Item 21. Exhibits and Financial Statement Schedules” in the Registration Statement on FormF-4 filed by Petróleos Mexicanos (PEMEX) (the FormF-4), (b) all references to DeGolyer and MacNaughton as set forth under the headings “Presentation of Information Concerning Reserves,” “Item 4. Information on the Company – Business Overview – Exploration and Production – Reserves,” and “Item 19. Exhibits. Documents filed as exhibits to this Form20-F” in the Annual Report on Form20-F of PEMEX for the year ended December 31, 2016 (theForm 20-F), incorporated in the FormF-4 by reference, and (c) the incorporation by reference in the FormF-4 of our third-party letter report dated April 17, 2017 (the Report), describing our review of the estimates of proved oil, marketable gas, sales gas, condensate, natural gas liquids (NGL), and oil equivalent reserves that PEMEX has represented are owned by the United Mexican States (México), as of January 1, 2017, for certain fields located in the Burgos area of México, which includes reserves that PEMEX has represented that it has the right to extract and sell. The Report was originally filed as Exhibit 10.6 to theForm 20-F. The estimates included in the Report were prepared in accordance with the reserves definitions of Rules4-10(a) (1)-(32) of RegulationS-X of the United States Securities and Exchange Commission.
| Very truly yours, |
| /s/ DEGOLYERAND MACNAUGHTON |
| DeGOLYER and MacNAUGHTON |
Texas Registered Engineering |
Firm F-716
Exhibit 23.8 (2 of 2)
DeGolyer and MacNaughton
5001 Spring Valley Road
Suite 800 East
Dallas, Texas 75244
September 19, 2017
Dr. José Antonio González Anaya
Director General
Petróleos Mexicanos
Avenida Marina Nacional No. 329
Torre Ejecutiva, Piso 44
Colonia Verónica Anzures
11300 Ciudad de México, México
Dear Dr. González Anaya:
We hereby consent to (a) all references to DeGolyer and MacNaughton as set forth under the headings “Experts” and “Item 21. Exhibits and Financial Statement Schedules” in the Registration Statement on FormF-4 filed by Petróleos Mexicanos (PEMEX) (the FormF-4), (b) all references to DeGolyer and MacNaughton as set forth under the headings “Presentation of Information Concerning Reserves,” “Item 4. Information on the Company – Business Overview – Exploration and Production – Reserves,” and “Item 19. Exhibits. Documents filed as exhibits to this Form20-F” in the Annual Report on Form20-F of PEMEX for the year ended December 31, 2016 (theForm 20-F), incorporated in the FormF-4 by reference, and (c) the incorporation by reference in the FormF-4 of our third-party letter report dated April 17, 2017 (the Report), describing our review of the estimates of proved oil, marketable gas, sales gas, condensate, natural gas liquids (NGL), and oil equivalent reserves that PEMEX has represented are owned by the United Mexican States (México), as of January 1, 2017, for certain fields located in the Veracruz area of México, which includes reserves that PEMEX has represented that it has the right to extract and sell. The Report was originally filed as Exhibit 10.6 to theForm 20-F. The estimates included in the Report were prepared in accordance with the reserves definitions of Rules4-10(a) (1)-(32) of RegulationS-X of the United States Securities and Exchange Commission.
| Very truly yours, |
| /s/ DEGOLYERAND MACNAUGHTON |
DeGOLYER and MacNAUGHTON Texas Registered Engineering |
FirmF-716