Oil prices jumped on Friday supported by fresh investment and a weaker dollar, which makes fuel cheaper for importers using other currencies, but analysts warned that a stronger price rally was premature as a global glut remained in place. U.S. crude futures CLc1 were trading at $38.64 a barrel at 0749 GMT, up 80 cents and over 2 percent from their last close. Traders said reports that commodity merchant Gunvor was the latest company to export U.S. sweet crude also supported WTI prices. Brent crude futures LCOc1 were at $40.70 a barrel, up 65 cents. May WTI’s discount to May Brent has narrowed to 51 cents a barrel on Friday from $1.23 a barrel on Tuesday. Traders said that much of the oil price support came from the Chinese yuan hitting its highest level in 2016 […]