Reuters | Oil mixed as investors short-cover and Saudi boosts output Reuters China has indicated that it could place a tariff of 25 percent on U.S. oil. If that happens, “Chinese demand would then shift to other suppliers. Because the oil market is already in tight supply due to the numerous outages, this would drive ... US oil benchmark rises, but posts weekly loss Oil Closes Higher On Supply Risks Iran Looks To Barter Oil As US Sanctions Bite |