Oil prices notched the longest losing streak in more than three decades on Friday as concerns about oversupply have rapidly returned to the market. The recent fall has wiped out all of oil’s gains for 2018. Light, sweet crude for December delivery fell 0.8% to $60.19 a barrel on the New York Mercantile Exchange, closing at its lowest levels since February. Brent, the global benchmark, declined 0.7% to $70.18 a barrel. U.S….