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Making diesel from crude oil in the US has never been more profitable. The diesel crack spread, which measures how much money refiners earn by converting a barrel of crude into diesel fuel, surged to an intraday record of $102.20 per barrel on August 17. It’s the first time this benchmark has crossed the $100 mark, and it reflects a global fuel market that’s being squeezed from nearly every direction simultaneously.
To put that number in perspective, the previous record was roughly $97 to $98 per barrel, set just five months ago in mid-March. A typical diesel crack spread in calmer times hovers in the $20 to $40 range. So $102 is not a blip. It’s a flashing red signal about the state of global fuel supply.
Why diesel margins are breaking records
The short answer: too many things going wrong at once. Ongoing conflicts in Iran and Ukraine continue to disrupt energy flows. Attacks on Middle Eastern refineries have taken processing capacity offline. And Russia’s ban on diesel exports, extended until at least January, has removed one of the world’s largest diesel suppliers from the market.
Layer on top of that the seasonal timing. August sits squarely in peak agricultural demand season across both the Northern and Southern Hemispheres. Diesel powers the tractors, combines, and transport trucks that keep food supply chains moving. When farmers in Iowa and Argentina both need fuel at the same time and global supply is constrained, prices respond accordingly.
Then there’s the inventory picture, which looks genuinely alarming. US distillate inventories stood at just 107.1 million barrels as of August 7. That’s the lowest level for this time of year since 1996. Three decades of inventory data, and we’re at the bottom.
US refiners have noticed the opportunity and are cranking up production to capture these historically fat margins. But here’s the problem: strong export demand keeps pulling barrels overseas before they can replenish domestic stockpiles. American refineries are essentially running harder and still falling behind.
The global refining picture
Zooming out, the supply crunch extends well beyond US borders. Global refinery throughput averaged 80.9 million barrels per day in July, a decline of roughly 5 million barrels per day compared to the same period last year. That’s an enormous drop in processing capacity at a time when the world desperately needs more fuel, not less.
The decline is partly structural and partly geopolitical. Attacks on refining infrastructure in the Middle East have forced unplanned shutdowns. Meanwhile, US policy pressure on Iranian oil exports to China has further complicated the picture by threatening to remove additional crude supply from the market.
Russia’s export ban deserves particular attention. Before the ban, Russia was one of the world’s top diesel exporters, shipping large volumes to Europe and other markets. With those barrels off the table until at least January, European buyers have been scrambling for alternatives, bidding up prices and redirecting cargoes that might otherwise have stayed in the US market.
What this means for the real economy
Diesel isn’t just another commodity. It’s the fuel of commerce. Nearly every physical good that moves by truck, train, or ship at some point depends on diesel.
Agriculture is especially exposed. Harvest season requires enormous diesel consumption for both field operations and grain transport.
For energy investors, the environment looks favorable for refining-heavy companies. Valero, Marathon Petroleum, and Phillips 66, the three largest independent US refiners, are well-positioned to benefit as long as the spread remains elevated.
Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.
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