EX-10.5



 Exhibit 10.5 

(Part 1 of 2) 

DEGOLYER AND MACNAUGHTON 

5001 SPRING VALLEY ROAD 

SUITE 800 EAST 

DALLAS, TEXAS 75244 

April 26, 2018 
 Ing. Carlos Alberto
Treviño Medina 
 Director General 
 Petróleos
Mexicanos 
 Avenida Marina Nacional No. 329 
 Torre
Ejecutiva, Piso 44 
 Colonia Verónica Anzures 
 11300
Ciudad de México, México 
 Dear Ing. Treviño Medina: 

We hereby consent to the 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 Form
20-F” in the Annual Report on Form 20-F of Petróleos Mexicanos (PEMEX) for the year ended December 31, 2017 (the Form
20-F), and to the filing as Exhibit 10.6 to the Form 20-F of our report of third party dated April 20, 2018, describing our independent reserves evaluation of the
estimated 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, 2018, for certain fields
located in the Burgos area of México, which include reserves that PEMEX has represented that it has the right to extract and sell. These estimates were prepared ‘in accordance with the reseres definitions of Rules 4-10(a) (1)-(32) of Regulation s-x of the United States Securities and Exchange Commission. 

 

	
	Very truly yours,
	
	




	DeGOLYER and MacNAUGHTON
	Texas Registered Engineering Firm F-716









 Exhibit 10.5 

(Part 2 of 2) 

DEGOLYER AND MACNAUGHTON 

5001 SPRING VALLEY ROAD 

SUITE 800 EAST 

DALLAS, TEXAS 75244 

April 26, 2018 
 Ing. Carlos Alberto
Treviño Medina 
 Director General 
 Petróleos
Mexicanos 
 Avenida Marina Nacional No. 329 
 Torre
Ejecutiva, Piso 44 
 Colonia Verónica Anzures 
 11300
Ciudad de México, México 
 Dear Ing. Treviño Medina: 

We hereby consent to the 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 Form
20-F” in the Annual Report on Form 20-F of Petróleos Mexicanos (PEMEX) for the year ended December 31, 2017 (the Form
20-F), and to the filing as Exhibit 10.6 to the Form 20-F of our report of third party dated April 20, 2018, describing our independent reserves evaluation of the
estimated 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, 2018, for certain fields
located in the Veracruz area of México, which include reserves that PEMEX has represented that it has the right to extract and sell. These estimates were prepared in accordance with the reserves definitions of Rules 4-10(a) (l)-(32) of Regulation S-X of the United States Securities and Exchange Commission. 

 

	
	Very truly yours,
	
	




	DeGOLYER and MacNAUGHTON
	Texas Registered Engineering Firm F-716