Oil tumbles on slowing Chinese demand, U.S.-China trade spatBy Stephanie Kelly NEW YORK (Reuters) – Oil prices slid about 3 percent on Wednesday as a trade dispute between the United States and China escalated further and after Chinese import data showed a slowdown in energy demand. U.S. West Texas Intermediate (WTI) crude futures fell $2.23 to settle at $66.94 a barrel, a 3.22 percent loss. China is slapping additional tariffs of 25 percent on $16 billion worth of U.S. imports, from fuel and steel products to autos and medical equipment.