Toronto Star | Oil tumbles 4% on global glut, OPEC output boost Toronto Star Oil's recovery from a six-year low has stuttered amid speculation the price rally is spurring production. Iraq is joining Saudi Arabia in boosting output as OPEC members defend market share against higher-cost producers. Investors have avoided assets ... Crude Oil Price Dips as Inventory Climbs Oil tumbles as US crude stockpiles rise UPDATE 1-US crude oil stockpiles rise for first time since April - EIA |