The U.S. dollar .DXY hit a one-week low, which can attract investors to oil by making crude cheaper for buyers using other currencies. “We have chipped away at crude losses today, and you could easily say it’s a function of a weak dollar,” said Bob Yawger, director of energy futures at Mizuho. Since the stock market began falling sharply early this month, oil prices have wiped away the year’s gains amid a volatile stock market.