Diesel Crack Spread Hits Record $97 as Refining Crunch Deepens

Global diesel supply is tightening faster than crude, with the U.S. crack spread at a record $97 a barrel as three refining hubs sit offline.

The oil market's real squeeze is in refined products, not crude: the U.S. diesel crack spread hit a record $97 a barrel Thursday while Brent held near $90, with three refining hubs disrupted.

"The global oil market's tightness is showing up through crack spreads rather than crude prices," said Sam Burwell, an analyst at Jefferies.

The International Energy Agency now sees a third-quarter supply deficit of 1.8 million barrels a day, more than double its prior estimate, as the Strait of Hormuz closure, Ukrainian drone strikes on Russian refineries and a Chinese export ban remove capacity. Middle East diesel exports have fallen 80 percent from a year earlier, per Kpler data, while Russia has banned diesel exports and China has halted product shipments to Asia. That leaves the U.S. as the only major refining hub running at full tilt, with plants processing 17.3 million barrels a day at more than 97 percent of capacity.

The crunch is reaching consumers: average U.S. diesel prices climbed 44 cents over the past month to $5.32 a gallon, according to AAA, while refined products trade at $130 to $170 a barrel. With winter heating demand approaching and inventories near five-year lows, analysts warn the squeeze could persist into 2027.

Three Hubs Offline, One Carries the Load

The disruption spans the Middle East, Russia and China. Hormuz traffic has fallen to about 10 ship transits a day from 30 to 40 before the escalation, with liquid cargo flows of roughly 4 million barrels a day versus an estimated 9 million, per HSBC analysts. Russian refining ran near a 20-year low at 3.9 million barrels a day in July as drone attacks hit most plants west of the Urals, cutting fuel exports to 1.4 million barrels a day, about half of year-earlier levels. China's crude imports dropped about 5 million barrels a day after the strait closed, and while July recovered by roughly 1 million barrels a day, imports remain about 3 million barrels a day below the five-year average near 11 million.

The U.S. is absorbing the shortfall. ExxonMobil, which operates the world's largest refinery network outside China, sees the trend continuing because about 5 million barrels a day of global refining capacity cannot reach the market. Citi's Anthony Yuen warned that observable global diesel inventories sit below five-year lows, a level last seen in 2022 when crack spreads ran about $20 a barrel lower than today.

Winter Looms as Inventories Drain

The tightness is most acute in diesel, which powers trucks, construction and farm equipment and accounts for roughly a fifth to a quarter of trucking operating costs, per the American Trucking Associations. "Diesel is the tightest market right now," said Amrita Sen, founder of Energy Aspects. "I think we are underestimating just how tight diesel can be this winter."

The Energy Information Administration raised its 2026 retail diesel forecast to $4.85 a gallon from $4.61 last month. With U.S. refineries already at about 96 percent of capacity, any hurricane-related outage or fall maintenance could tighten supply further. The last time refined-product inventories ran this low, in 2022, diesel prices peaked at $5.82 a gallon in June before easing.

The path forward hinges on Hormuz. Negotiations between Washington and Tehran have stalled, with Polymarket pricing the chance of a 60-day extension at about 25 percent, down from 80 percent a week earlier. "Even if we see de-escalation in the Middle East and crude prices falling, product prices are probably going to remain high," said Gregory Brew, an analyst at Eurasia Group. If China resumes crude imports toward the 11 million barrels-a-day average, that would add roughly 3 million barrels a day of demand and support crude prices, Burwell said.

This article is for informational purposes only and does not constitute investment advice.