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VIENNA -- OPEC ministers are coming to a meeting divided on how much crude to pump.

The Saudis want to keep a lid on oil prices, Iran is pushing to cut production and Iraq is expected to back Tehran.

The divisions will test the unity of the Organization of the Petroleum Exporting Countries, which sees itself as the oil market's prime regulator.

The 12-nation group is likely to paper over differences Thursday by deciding to leave output unchanged despite overproduction. But the disagreements might be too deep to overcome and the meeting could break up in disarray.

The gathering comes as many of the world's major consuming nations struggle against a stubborn economic downturn that could be exacerbated by any decision to inflate prices by cutting supply.