Oil prices edged lower on Tuesday, retreating from near-five-month highs in advance of data expected to show a build in U.S. crude inventories.
The market, however, remained buoyant ahead of Friday's meeting between the Organization of the Petroleum Exporting Countries with non-OPEC producers to discuss progress of their 1.8-million barrel per day supply cut deal.
OPEC's second-biggest producer Iraq said that the group was discussing several options for its supply pact, including an extension beyond March and a further output cut.
Nigeria and Libya will send representatives to the meeting despite being exempt from the current deal, two OPEC sources said. Rising output from both countries has kept a lid on price gains, prompting suggestions that they could be included in the deal.