Exhibit 10.3

(1 of 2)



|     |                                                                                                                                            |                           
|---- | ------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------
|LOGO |                                                                                                                                            | PRESIDENT - ROBERT C. BARG
|     | VICE
PRESIDENTS ALLEN E. EVANS, JR.
RANDOLPH K. GREEN JOHN G. HATTNER C. H (SCOTT)
REES III DANNY S SIMMONS
DAN PAUL SMITH THOMAS M SOUERS

June 27, 2011

Dr. Juan José Suárez Coppel

Director General

Petróleos Mexicanos

Avenida Marina
Nacional No. 329

Colonia Petróleos Mexicanos C.P. 11311

Mexico

Dear Dr. Suárez Coppel:

We hereby consent to all references to our firm as set forth in the Annual Report on Form 20-F of Petróleos Mexicanos for the year ending
December 31, 2010 (the Form 20-F), under the heading Exploration and Production (Reserves), and to the filing of our audit letter dated February 1, 2011, as an exhibit to the Form 20-F. We have audited the estimates
of proved oil, condensate, natural gas, and oil equivalent reserves owned by the United Mexican States (Mexico) as of December 31, 2010, for 28 fields located offshore Mexico in the Northeastern Marine Region. These estimates were
prepared by Pemex Exploración y Producción in accordance with the reserves definitions of Regulation S-X Rule 4-10(a) of the U.S. Securities and Exchange Commission.



Sincerely, 
NETHERLAND, SEWELL INTERNATIONAL, S. DE R.L. DE C.V.By:

/s/ Robert C. BargRobert C. Barg, P.E.
President


1601 ELM STREET, SUITE 4500 
DALLAS, TEXAS 75201-4754  PH: 214-969-5401  FAX: 214-969-5411



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Exhibit 10.3

(2 of 2)



|     |                                                                                                                                              |                           
|---- | -------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------
|LOGO |                                                                                                                                              | PRESIDENT - ROBERT C. BARG
|     | VICE
PRESIDENTS ALLEN E. EVANS, JR.
RANDOLPH K. GREEN JOHN G. HATTNER C. H. (SCOTT)
REES III DANNY S SIMMONS
DAN PAUL SMITH THOMAS M. SOUERS

June 27, 2011

Dr. Juan José Suárez Coppel

Director General

Petróleos Mexicanos

Avenida Marina
Nacional No. 329

Colonia Petróleos Mexicanos C.P. 11311

México

Dear Dr. Suárez Coppel:

We hereby consent to all references to our firm as set forth in the Annual Report on Form 20-F of Petróleos Mexicanos for the year ending
December 31, 2010 (the Form 20-F), under the heading Exploration and Production (Reserves), and to the filing of our audit letter dated February 1, 2011, as an exhibit to the Form 20-F. We have audited the estimates
of proved oil, condensate, natural gas, and oil equivalent reserves owned by the United Mexican States (Mexico) as of December 31, 2010, for 120 fields located onshore Mexico in the Southern Region. These estimates were prepared by
Pemex Exploración y Producción in accordance with the reserves definitions of Regulation S-X Rule 4-10(a) of the U.S. Securities and Exchange Commission.



Sincerely, 
NETHERLAND, SEWELL INTERNATIONAL, S. DE R.L. DE C.V.By:

/s/ Robert C. BargRobert C. Barg, P.E.
President


1601 ELM STREET, SUITE 4500 
DALLAS, TEXAS 75201-4754  PH: 214-969-5401  FAX: 214-969-5411