Oil prices were mixed on Friday, with short-covering pushing up U.S. crude futures while Brent slipped on global trade tensions and increased Saudi production.
For the week, WTI posted a loss of about a half a percent, while Brent was on track for a decline of about 3 percent.
"We have a little bit of a rally that's materialized" for WTI, said Bob Yawger of director of energy futures at Mizuho in New York. The rally appears to be a "short covering situation — we were down almost 2 percent yesterday," said Yawger.
U.S. crude futures slipped on Thursday after data showed an unexpected 1.3 million-barrel build in crude inventories.