Oil down for day on strong dollar, up for week on OPEC hope

By Ethan Lou NEW YORK (Reuters) - Oil prices were down slightly on Friday, weighed by a stronger dollar and oversupply concerns, but expectations for a cut in production from OPEC had Brent and U.S. crude on track for their first weekly gains in about a month. The Organization of the Petroleum Exporting Countries (OPEC) is moving closer to finalising its first deal since 2008 to limit output, with most members prepared to offer Iran flexibility on production volumes, ministers and sources said.