Talks between Saudi Arabia, fellow OPEC member Venezuela and oil powers Russia and Mexico failed to find an agreement to address a growing oil glut on Tuesday, with no side saying they would lower output despite a collapse in prices.
Oil prices turned lower after the meeting, with international benchmark Brent falling more than $1 a barrel to near $78.
In a day of shuttle diplomacy ahead of OPEC's crucial output meeting in Vienna on Thursday, Russian and Mexican energy officials rushed to the Austrian capital to push OPEC kingpin Saudi Arabia on the 30 percent price fall since June.
Saudi has kept the market guessing about its response to crude's fall, but the meeting on Tuesday led to speculation and hopes in some quarters that Riyadh was considering backing a coordinated cut. Those hopes did not last long.
Venezuelan Foreign Minister Rafael Ramirez told reporters after the meeting that while all sides agreed current prices were "not good" for producing countries, no output cuts could be arranged - or guaranteed at Thursday's OPEC meeting.
"We discussed the situation in the market, we shared our points of view, we need to keep in contact and we agreed to meet again in three months," Ramirez, who until recently was oil minister and president of state oil company PDVSA, said.
Venezuela, a noted price hawk, would try for an output agreement within OPEC instead, he said.