Oil edged up to $65 a barrel on Tuesday as OPEC was expected to stick to its production cuts despite pressure from US President Donald Trump, although the prospect of higher Libyan output capped gains.
Prices slid on Monday, when many traders were out of the office attending IP Week, an industry event in London, after Trump called on OPEC to ease its efforts to boost the oil market. Prices were "getting too high", the president said.
"Yesterday was a typical price action you see during IP Week when you have a headline," said Olivier Jakob, analyst at Petromatrix. "But I don't think it will change anything in current OPEC supply policy."
Brent crude, the global benchmark, rose 25 cents to $65.01 by 1429 GMT, after losing 3.5 percent on Monday. US West Texas Intermediate crude eased 19 cents to $55.29.
The chance of more oil from Libya and expectations of higher US crude inventories limited the rally.
Libya's internationally recognised government agreed with the state oil company to reopen the country's largest oilfield, El Sharara, according to a statement on Tuesday.
US crude stocks were seen 3.6 million barrels higher in weekly inventory reports. The first such report is due at 2130 GMT from the American Petroleum Institute.
Oil is up about 20 percent since the start of the year, when the Organization of the Petroleum Exporting Countries and other producers, such as Russia, began cutting output in an effort to reduce a global glut.
Saudi Arabia and other OPEC members are likely to be cautious about relaxing their supply-cut plan, Jakob said, after a boost in output in the second half of last year ahead of US sanctions on Iran led to a steep slide in prices.
Oil broker PVM took a similar view.
"Will the kingdom budge and increase production or at least keep it steady," said PVM's Tamas Varga. "Just two weeks after announcing deeper cuts, it would be a capitulation."
An OPEC source, in comments to Reuters, agreed OPEC would stick to its current policy.
US sanctions against OPEC members Iran and Venezuela have also contributed to the gains and are providing a price floor, analysts say.
Optimism about a US-China trade deal also helped prices to rally.
Trump on Monday said he may soon sign a deal to end a trade war with Chinese President Xi Jinping if their countries can bridge remaining differences.