Old disputes between Saudi Arabia and rival Iran resurfaced at a meeting of OPEC experts last week, with Riyadh threatening to raise oil output steeply to bring prices down if Tehran refuses to limit its supply, OPEC sources say.
Clashes between the two OPEC heavyweights, which are fighting proxy wars in Syria and Yemen, have become frequent in recent years.
Tensions subsided, however, in recent months after Saudi Arabia agreed to support a global oil supply limiting pact, thus raising the prospect that the Organization of the Petroleum Exporting Countries would take steps to boost oil prices.
But a meeting of OPEC experts last week, designed to work out details of cuts for the next OPEC ministerial gathering on Nov. 30, saw Saudis and Iranian clashing again, according to four OPEC sources who were present at the meeting and spoke to Reuters on condition of anonymity.
"The Saudis have threatened to raise their production to 11 million barrels per day and even 12 million bpd, bringing oil prices down, and to withdraw from the meeting," one OPEC source who attended the meeting told Reuters.