West Texas Intermediate oil was traded close to the lowest level in more than one week on Thursday after the U.S. government reported that inventories in the country rose to the strongest level in 82 years. WTI for delivery next month was traded at $90.87 a barrel on the NYMEX, while yesterday it decreased $2.43 to close at $91.03, recording the largest drop since April 15 and the lowest since April 23.