Oil lost more of the ground it had gained early this week as US crude and gasoline inventories increased, undercutting expectations for tightening supplies.
Oil settled little changed Tuesday, after swinging between gains and losses, with OPEC+ set to affirm its policy of production cuts amid tensions in the Middle East and Russia.
The meeting was co-chaired by OPEC Secretary General Haitham Al Ghais and Zhang Jianhua, the administrator of the National Energy Administration of the People's Republic of China.
Oil edged lower to settle below $81 a barrel after a stronger dollar curbed investor appetite for commodities, offsetting signs of a tighter global crude market.