Oil extended gains above $52 a barrel as a planned production boost from Libya stalled amid continuing tension in the OPEC member that’s exempt from output cuts. Futures climbed as much as 1.2 percent in New York after rising 2 percent on Friday. Libyan oil-facility guards backtracked on an agreement to allow supply to flow from the El Feel and Sharara fields, two of the country’s biggest, according to an engineer that operates El Feel. Money managers increased their net-long positions in West Texas Intermediate crude to the highest since July 2014, U.S. Commodity Futures Trading Commission data showed. Oil has traded near $50 a barrel since the Organization of Petroleum Exporting Countries agreed Nov. 30 to reduce production for the first time in eight years. Goldman Sachs Group Inc. last week increased its second-quarter crude-price forecasts and predicted stockpiles would return to normal by mid-2017 amid the curbs, […]