Oil swung between gains and losses near the lowest closing price in almost four weeks as investors weighed a slowing pace of U.S. drilling-rig reductions against an interest rate cut in China. Futures in New York rose as much as 0.5 percent and fell as much as 0.4 percent. The number of active machines targeting oil dropped by 1 through Oct. 23 after declining by 45 over the prior three weeks, according to Baker Hughes Inc. China, the world’s second-biggest crude consumer, stepped up monetary easing with its sixth interest-rate cut in a year on Friday to combat deflationary pressures and a slowing economy. Oil is failing to sustain a rally earlier this month above $50 a barrel as surging U.S. inventories bolstered speculation that a global glut will be prolonged. World crude supplies will remain ample until at least the middle of 2016 while investments in the industry […]