Brent crude was down 15 cents, or 0.3%, at $48.10 a barrel by 0155 GMT, after gaining 1.8% on Wednesday.
Oil prices fell on Thursday as producers including Saudi Arabia and Russia locked horns over the need to extend record production cuts set in place in the first wave of the COVID-19 pandemic.
Brent crude was down 15 cents, or 0.3%, at $48.10 a barrel by 0155 GMT, after gaining 1.8% on Wednesday. U.S. oil was down 17 cents, or 0.4%, at $45.11 a barrel, having ended 1.6% higher the previous session, as reported by Reuters.
The Organization of the Petroleum Exporting Countries (OPEC) and Russia are resuming discussions on Thursday to agree on policies for 2021 after earlier talks produced no compromise on how to tackle weak oil demand amid a new coronavirus wave.
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But after hopes for a speedy approval of anti-virus vaccines spurred a rally in oil prices at the end of November, some producers questioned the need to tighten oil policy, which is supported by OPEC leader Saudi Arabia.