Oil mixed as OPEC cites uncertain market outlook for 2018


Oil prices were mixed on Tuesday, with U.S. crude gaining and Brent crude largely unchanged, as investors prepared for a key meeting of the OPEC producer group next week.

Brent crude futures dipped 3 cents to trade at $76.43 a barrel by 11:35 a.m. (1530 GMT), while U.S. West Texas Intermediate...