Oil ended lower on Wednesday after reports that Iran's oil minister said divisions exist within OPEC, leading futures to give up earlier gains on OPEC-led production curbs and export cuts from Libya.
Crude pared gains late in the session after reports that Iran's Oil Minister Bijan Zanganeh told state television that the cartel had been unfriendly toward OPEC's third largest producer.
OPEC last week agreed to production cuts only after Iran, whose crude exports have been depleted by U.S. sanctions since early November, greenlighted the deal.
OPEC said on Wednesday it had offset a drop in sanctions-hit exports from Iran. Iran's President Hassan Rouhani also said on state TV on Tuesday that exports have improved since early November.
Earlier in the trading day, prices rose, bolstered by export cuts from Libya and planned OPEC-led production cuts