Okla. Stat. tit. 18, § 2018

Voting by managers may be on a per capita, number, financial interest, class, group or any other basis. Unless otherwise provided in the articles of organization or operating agreement, if the limited liability company has more than one manager, all decisions of the managers shall be made by majority vote of the managers on a per capita basis. An operating agreement may grant to all or certain identified managers or a specified class or group of the managers the right to vote, separately or with all or any class or group of managers or members, on any matter.