Censor.NET reports citing Reuters.
U.S. crude CLc1 was trading at $39.52 a barrel at 0414 GMT, down 45 cents. Internationally traded Brent futures LCOc1 were down 35 cents at $42.66 per barrel. This left both benchmarks near 2015 lows and not far off levels seen during the peak of the global financial crisis of 2008/2009.
The Organization of the Petroleum Exporting Countries failed to agree on an oil production ceiling on Friday after a disagreement between Saudi Arabia and Iran meant that the group for the first time in decades didn't even mention an output quota, which previously stood at 30 million barrels per day (bpd).
By ditching any output limits, analysts said the group was sending a message to other producers such as Russia or North American shale drillers that it was willing to accept low oil prices to defend market share.
"OPEC is sending an ultimatum to its competitors: the fall in oil production should come from them," OCBC bank said.
Morgan Stanley said OPEC "believes its strategy is slowly working".
OPEC's output of more than 30 million bpd has compounded an oil glut, pushing production 0.5 million to 2 million bpd beyond demand and putting many producers under pressure, especially small-sized U.S. shale drillers which have piled up large amounts of debt.
Analysts said that OPEC would likely maintain production around 31.5 million bpd and that a strategy on how to deal with new Iranian volumes once sanctions against Iran are dropped would be discussed at the group's next meeting in June 2016.
Because of ongoing oversupply, analysts said that prices would fall further.