Oil rebounded from its longest losing streak in two months as uncertainty over an OPEC output deal amid growing U.S. crude stockpiles and the upcoming American election kept markets volatile. U.S. inventories rose by a record last week, and OPEC members claiming exemption from an agreement to limit supplies boosted production in October. While the stockpile gain was a “big surprise,” prices are recovering after falling 8.8 percent the last four sessions, according to Hyundai Futures Corp. A measure of oil volatility is near the highest level in more than a month as investors in broader financial markets stay cautious amid a tightening White House race. “With many uncertainties lined up such as the U.S. elections and an additional interest rate hike as well as the OPEC meeting, the market will remain volatile throughout this year,” Will Yun, a commodities analyst at Hyundai Futures, said by phone from Seoul. […]