U.S. crude inventories will expand to a record 550 million barrels this month before starting their seasonal slide, according to a forecast by Citigroup Inc. Stockpiles rose 2.8 million barrels to 543.4 million last week, the most in more than 86 years, according to data from the Energy Information Administration. Inventories reached the highest ever at 545.2 million barrels in October 1929, according to monthly EIA data.

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