EX-99.4 5 a2190827zex-99_4.htm EXHIBIT 99.4
QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 99-4

CONSENT OF GLJ PETROLEUM CONSULTANTS LTD.

TO: |  | Suncor Energy Inc. The Securities and Exchange Commission The Securities Regulatory Authorities of Each of the Provinces of Canada

Dear Sirs

Re: Suncor Energy Inc.

We refer to the following report (the "Report"), prepared by GLJ Petroleum Consultants Ltd.:

•
  the Reserves Assessment and Evaluation of Canadian Oil and Gas Properties of Suncor Energy Inc. effective December 6, 2008 and dated February 6, 2009;

We hereby consent to the use of our name, reference to and excerpts from the said Report by Suncor Energy Inc. in its Annual Report on Form 40-F and the incorporation by reference in the registration statements on Form F-3 (File No. 333-7450), Form S-8 (File No. 333-87604), Form S-8 (File 333-112234), Form S-8 (File No.333-118648), Form S-8 (File No. 333-124415), Form S-8 (File No. 333-149532), Form F-9 (File No. 333-14242), Form F-9 (File No. 333-140797) and Form F-9 (File No. 333-151347) of Suncor Energy Inc., of our Report.

We have read the AIF and the Form 40-F and have no reason to believe that there are any misrepresentations in the information contained therein that is derived from our Report or that are within our knowledge as a result of the services which we performed in connection with the preparation of the Reports.

|  | Yours very truly,
|  | GLJ PETROLEUM CONSULTANTS LTD.
|  | "GLJ PETROLEUM CONSULTANTS LTD."
|  | Dana B. Laustsen, P. Eng. Executive Vice-President
Dated: March 2, 2009 Calgary, Alberta CANADA |  |

QuickLinks

EXHIBIT 99-4

CONSENT OF GLJ PETROLEUM CONSULTANTS LTD.