Diesel is where the oil shock bites, and a US export ban would ship it to Europe
Front-month Brent rose above $107 and WTI above $95 on Monday after Trump rejected Iran's Hormuz offer, but the sharper signal is the $7.65 gap between November and December futures and a UK diesel price at an all-time high. The desk expects Washington to keep threatening an export ban rather than sign one.
November Brent was trading at $107.73 a barrel in the London afternoon on Monday, up 3.3% and on track for its highest close since September 15, after Donald Trump rejected Tehran's weekend offer to reopen the Strait of Hormuz, as Reuters reported. The futures curve carries more information than that headline number. November Brent, the contract expiring this week, trades $7.65 above December, which is sitting just above $100. Crude supply is tight, and diesel is where the shortage is appearing most clearly.
Backwardation this steep means the market is paying up for oil available now over oil available in six weeks. A couple of dollars would normally cover that gap; seven is unusual. WSJ's Joe Wallace called it a shortage flag, and the label fits. WTI, the US benchmark, rose 3.3% to $95.47 by late morning in New York, while the Brent-WTI gap stayed near its widest since May for reasons discussed below. The spreads between contract months and crude grades carry more information than either headline price.
Trump spent the weekend rejecting a seven-day Iranian plan, floated through Qatari mediators at the UN General Assembly, to reopen the strait and end the fighting that began when the US and Israel struck Iran in February. He told Axios he expects fresh talks this week, and Qatar is running separate sessions with Iran's foreign minister, Abbas Araqchi, and with the American side on Monday and Tuesday. Flows through Hormuz remain far below their prewar level: the strait carried close to 20 million barrels a day before the conflict, and this month's traffic is running near 7.4 million.
Middle East exports are recovering. Kpler puts regional crude exports at 12.8 million barrels a day in September, the highest since the war started, as Saudi Arabia reroutes cargoes from a damaged East-West pipeline through Ras Tanura instead of Yanbu. The rebound remains well below the roughly 20 million barrels a day that moved through the strait before February. UBS's Giovanni Staunovo said flows remain below pre-conflict levels and the market remains undersupplied. The futures curve shows that traders still see inadequate supply.
The shortage shows up in diesel because the missing barrels are disproportionately the ones refined into middle distillates. UK pump prices for diesel hit 199.18 pence a litre on Monday, a record above the previous high set in June 2022, according to the RAC. The fuel cost 142.38 pence when the war started in February, a rise of roughly 40% in seven months, and works out to about $2.64 at current exchange rates. US diesel is up 77% over the past year. Russia, dealing with Ukrainian strikes on its refineries, has kept a diesel export ban in place since August 1 and is set to extend it through the end of October, with plans to cut shipments from its western ports almost entirely next month. China is running its own export curbs. The world's largest diesel sellers have reduced shipments at the same time.
Washington is considering the same restriction. Trump said again on Sunday that he is considering a ban on US diesel exports, and the market has already priced the threat: talk of it pushed Brent-WTI to its widest gap since May, the third such move in four sessions, because traders assume a ban would force US refiners to run less crude rather than sell fuel they cannot ship abroad. A refinery turns crude into a fixed slate of products together, including diesel, gasoline and jet fuel. Trapping diesel at home would make the economics of running that refinery worse and could lower throughput. Goldman has flagged Europe and Latin America as the destinations most exposed if US cargoes stop moving, and the UK sources much of its imported diesel from American refiners specifically. The shortage would move to allies already paying the highest diesel prices in years.
Congress ran a related experiment in 1975. The ban on US crude oil exports, imposed after the Arab embargo, lasted forty years and mainly rewarded refiners: it held WTI at a persistent discount to Brent without lowering what drivers paid at the pump, since gasoline and diesel were never covered by the ban and traded on world prices. Congress repealed it in December 2015 under pressure from producers who wanted access to global buyers. A diesel export ban would reverse the direction of the restriction while keeping the same lesson: limiting where fuel can go widens the spread between the restricted and open markets, shifting the pain across the border without adding supply.
The near-term costs are already showing up away from the pump. Aramco is weighing discounts on its official selling prices for oil loaded off Oman to compensate buyers for record freight rates. Retail fuel margins in Europe are being squeezed by dearer wholesale diesel and drivers unwilling to absorb the full increase, which is why Italy has summoned its refiners to a meeting on October 8 over pump prices. Diesel also runs the backup generators that keep hospitals, telecoms sites and data centres powering the current AI buildout online through grid outages. UK pump prices near $2.64 a litre and US prices 77% higher over a year raise the standing cost of that insurance for operators without locked-in fuel contracts.
November Brent expires this week, and the premium over December is the number to watch. Russia's export ban runs through the end of October. Qatar's mediators meet Iran's delegation and the American side on Monday and Tuesday on the amended seven-day proposal, testing whether Hormuz reopens before winter demand tightens the distillate market further. The desk expects Trump to keep threatening a diesel export ban without signing one because the arithmetic would worsen as soon as it took effect.