CNBC | Oil slips on worries that economic slowdown could weigh on fuel demand CNBC Oil prices slipped on Tuesday as concerns that an economic slowdown may curb fuel demand growth overshadowed the reintroduction of sanctions on Iran. U.S. West Texas Intermediate (WTI) crude futures were at $62.93 a barrel at 0131 GMT, down 17 ... Washington Issues Waivers, Warns Against Trading Oil With Iran Oil Prices Mixed as Iran Sanctions Take Effect Oil Bounces Higher On Supply Concern as Iran Sanctions Kick In |