
HOUSTON, Dec 15 (Reuters) - U.S. cash crude grades eased to their lowest levels since October on Monday as oversupply concerns pushed down export demand.
WTI Midland eased 5 cents, while WTI at East Houston eased 10 cents.
The spread between WTI and Brent widened to minus $3.88, but stayed narrower than the minus $4 level that encourages exports.
"We can't export it out... we don't have demand for it due to refinery turnarounds and the world is swimming with oil," a trading source said.