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OKLAHOMA CITY — T. Boone Pickens, a brash and quotable oil tycoon who grew even wealthier through corporate takeover attempts, died Sept. 11. He was 91.

Iran is racing to return an oil supertanker to international waters after a Gibraltar court determined it couldn’t wait for the United States to take action that would prolong the six-week detention of the vessel for allegedly violating trade sanctions.

A prestigious scientific organization on Oct. 11 called for more frequent and better inspections of freight railroad tracks to prevent potentially catastrophic oil and ethanol train crashes.

Oil advanced to the highest level since May after U.S. gasoline stockpiles plunged to a 22-month low and exports of crude and fuels surged.

Oil dropped to the lowest in seven months amid a revival in output from Libya and rising volumes of fuel held in floating storage.

The U.S. average retail price of diesel dropped 3.5 cents to $2.489 a gallon, while the stubborn glut of crude caused oil prices to tumble to about $43 a barrel — a range last seen in early August — and into a bear market, experts said.

Oil slipped to the lowest since November as weaker demand at the start of the summer driving season led to another increase in gasoline stockpiles.

Oil fell for a third week as rising supplies from the United States to Nigeria to Libya showed that OPEC is still struggling to clear a global glut.

Oil tumbled to the lowest intraday level in four weeks June 7, as U.S. industry data showed an unexpected increase in crude inventories. Gasoline stockpiles also rose.

Oil fell as U.S. drilling continued to rise, undermining the potential for even an extended OPEC output-reduction deal to rebalance the market.