Brent crude extended losses from a four-year low, trading near $80 a barrel amid signs that OPEC remains unwilling to reduce output to ease concern of a global supply glut. West Texas Intermediate was steady in New York . Futures slid as much as 0.7 percent in London, declining from the lowest close since September 2010. Saudi Arabia is committed to a stable market and speculation of a price war within the Organization of Petroleum Exporting Countries “has no basis in reality,” Oil Minister Ali Al-Naimi said yesterday in Acapulco, Mexico . Crude stockpiles in the U.S., the world’s biggest oil consumer, probably rose for a sixth week, a Bloomberg News survey shows before government data today. Oil has collapsed into a bear market as leading OPEC members resisted calls to cut production and instead reduced export prices to the U.S., where output has climbed to the highest level […]