EX-5.1

Exhibit 5.1

LOGO

609 Main Street

Houston, TX 77002

United States

+1 713 836 3600

www.kirkland.com

, 2023

Kodiak Gas Services, Inc.

15320 Highway 105 W, Suite 210

Montgomery, Texas 77356

Ladies and Gentlemen:

We are acting as special counsel to Kodiak Gas Services, Inc., a Delaware corporation (the “Company”), in connection with the preparation and filing of a Registration Statement on Form S-1, initially filed with the Securities and Exchange Commission (the “Commission”) on March 31, 2023 (File No. 333- ), under the Securities Act of 1933, as amended (the “Act”) (such Registration Statement, as amended or supplemented, is hereinafter referred to as the “Registration Statement”), relating to the proposed registration by the Company of up to shares of common stock, par value $0.01 per share, of the Company (“Common Stock”), including shares of Common Stock to cover the underwriters’ option to purchase additional shares, if any. The shares of Common Stock to be sold by the Company identified in the Registration Statement are referred to herein as the “Shares,” and the issuance of the Shares is referred to herein as the “Issuance.”

In that connection, we have examined originals, or copies certified or otherwise identified to our satisfaction, of such documents, corporate records and other instruments as we have deemed necessary for the purposes of this opinion, including (i) the Amended and Restated Certificate of Incorporation of the Company in the form incorporated by reference as Exhibit 3.4 to the Registration Statement and to be filed with the Secretary of State of the State of Delaware at the closing of the initial public offering; (ii) the Amended and Restated Bylaws of the Company in the form incorporated by reference as Exhibit 3.5 to the Registration Statement; (iii) the form of Underwriting Agreement in the form filed as Exhibit 1.1 to the Registration Statement (the “Underwriting Agreement”), filed with the Commission on March 31, 2023; (iv) resolutions of the board of directors of the Company with respect to the Issuance and (v) the Registration Statement.

For purposes of this opinion, we have assumed the authenticity of all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies and the authenticity of the originals of all documents submitted to us as copies. We have also assumed the legal capacity of all natural persons, the genuineness of the signatures of persons signing all documents in connection with which this opinion is rendered and the due authorization, execution and delivery of all documents by the parties thereto other than the Company. We have not independently established or verified any facts relevant to the opinion expressed herein, but have relied upon statements and representations of officers and other representatives of the Company and others as to factual matters.

Based upon and subject to the foregoing qualifications, assumptions and limitations and the further limitations set forth below, we are of the opinion that, when (i) the final Underwriting Agreement is duly executed and delivered by the parties thereto and (ii) the Registration Statement becomes effective under the Act, the Shares have been duly authorized and will be validly issued, fully paid and non-assessable.

Our opinions expressed above are subject to the qualifications that we express no opinion as to the applicability of, compliance with, or effect of any laws except the General Corporation Law of the State of Delaware.

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