Oil benchmarks were headed for a seventh straight weekly decline on worries over a global supply surplus and weak Chinese demand.

Saudi Arabia and Russia, the world's two biggest oil exporters, on Thursday called for all OPEC+ members to join an agreement on output cuts for the good of the global economy, only days after a fractious meeting of the producers' club.

The Organization of the Petroleum Exporting Countries and allies, known as OPEC+, agreed to a combined 2.2 million barrels per day (bpd) in output cuts for the first quarter of next year.

"Despite OPEC+ members' pledges, we see total production from OPEC+ countries dropping by only 350,000 bpd from December 2023 into January 2024 (38.23 million bpd to 37.92 million bpd)," said Viktor Katona, lead crude analyst at Kpler.

Some of the OPEC+ countries may not adhere to their commitments due to muddied quota baselines and dependence on hydrocarbon revenues, Katona said.

Brent and WTI crude futures are on track to fall 4.2% and 4.5% for the week, respectively, their biggest losses in five weeks.

Concerns about China's economy and surging U.S. oil output have also fuelled the market's downturn this week.

Chinese customs data showed its crude oil imports in November fell 9% from a year earlier as high inventory levels, weak economic indicators and slowing orders from independent refiners weakened demand.

In India, fuel consumption in November fell after touching a four-month peak the previous month, hit by reduced travel in the world's third-biggest oil consumer as a festive boost fizzled.

In the United States, output remained near record highs of more than 13 million bpd, U.S. Energy Information Administration data showed on Wednesday.

Fixed price fuel card customers can expect another welcome drop of around 2 pence per litre for next week.

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