VIENNA—Iran’s oil minister said Tuesday he didn’t expect OPEC to reach a consensus on boosting oil output this week, saying Tehran was against any increase and threatening to turn the cartel’s meeting into an unusually contentious one.
Saudi Arabia, the de facto leader of the Organization of the Petroleum Exporting Countries, and Russia, the group’s main outside ally, have been pushing for an output increase when producers meet Friday and Saturday. OPEC meetings are often testy, with members squabbling publicly until the last...