CNBC | Oil drops on Iran sanction exemptions, economic concerns CNBC Oil prices slipped on Tuesday, weighed down by exemptions from Washington that will allow Iran's biggest oil customers to keep buying from Tehran, as well as concerns that an economic slowdown may curb fuel demand growth. U.S. West Texas ... Washington Issues Waivers, Warns Against Trading Oil With Iran Oil Prices Mixed as Iran Sanctions Take Effect Iran Sanctions and Oil Prices: Who'll Feel the Pain? |