Oil prices dip on doubts OPEC can coordinate output cut

By Henning Gloystein SINGAPORE (Reuters) - Oil prices dipped early on Friday, weighed down by lingering doubts over whether OPEC can coordinate a crude production cut big enough to rein in oversupply that has dogged markets for two years. International Brent crude oil futures were trading at $50.39 per barrel at 0033 GMT, down 8 cents from their last close. U.S. West Texas Intermediate (WTI) crude was down 5 cents at $49.67 a barrel. ...