Oil headed for its longest run of gains this year as Libya’s biggest oil field was said to have suffered another outage while Russia signaled it’s weighing an extension of OPEC-led production cuts. Futures gained for a fifth day in New York after advancing 3.2 percent last week following a U.S. military strike on Syria. Libya’s Sharara field stopped producing just one week after it reopened, according to two people familiar with the matter, although it wasn’t clear why. Russia’s energy ministry has been in discussions with oil companies regarding the need to prolong the six-month deal when it expires, Energy Minister Alexander Novak said Friday. Support from some members of the Organization of Petroleum Exporting Countries to extend the curbs has sparked a rally above $50 a barrel. The cuts have stabilized the market and Russia will continue to watch inventory levels, but it’s too early to decide […]