Hormuz Crude Is Flowing Again, but Diesel Is the Squeeze

Gulf producers had resumed crude transit through the Strait of Hormuz by October 5, 2026, just as a new wave of attacks on vessels around the waterway threatened to stall the recovery.

Saudi crude shipments through the Strait climbed from around 1.4 million barrels a day in late August to around 4.1 million barrels, according to Wall Street Journal reporting on October 5. The return to the Strait came alongside continued use of bypass routes, pipelines and sea lanes that avoid the chokepoint. In September, roughly 40% of the Middle East's crude oil exports bypassed Hormuz, compared with about 17% before the war, according to Wall Street Journal reporting on October 1. Analysts put total Middle East crude exports back at prewar levels.

Strait flows and bypass capacity

Iran's ability to choke off oil flowing through Hormuz is breaking down, weakening its leverage in talks with the U.S., the Wall Street Journal reported on September 28. That assessment followed weeks of uncertainty about actual liftings. Commercial ship trackers could not verify the high volumes passing through Hormuz claimed by the Trump administration, the Wall Street Journal reported on August 24. Gaps in AIS, the radio tracking signal ships broadcast, dark transits with trackers switched off, and loadings outside the Strait complicated verification.

September data cleared up part of that dispute. More barrels moved. More barrels avoided the chokepoint entirely. Gulf producers resumed transit through Hormuz by October 5, according to Reuters. Then attacks on shipping resurged, putting that recovery at risk, according to Wall Street Journal reporting on October 5.

Crude prices moved with the headlines. Oil prices fell about 2% on September 25 amid hopes for a truce between the United States and Iran, according to Reuters. Reports in early October that China had halted fuel exports coincided with a 4% jump in oil prices, according to Reuters. Flat price, the headline price for a barrel of crude itself, swung on both flow news and fuel-export policy.

Products take the strain

A shortage of refining capacity created bottlenecks across the energy market in early October, according to Reuters. Refining is the conversion of crude into usable gasoline and diesel. Like a narrow bridge after a wide highway, crude can clear Hormuz or bypass it. That conversion step cannot be rerouted as easily.

Tightness in distillates, the diesel-type fuels, was visible well before October. In July, gasoline and diesel markets signaled a fuel supply crunch despite relatively subdued crude oil prices, according to Reuters. That gap between crude and products lasted into autumn.

Several outages and policy moves came on top. Ukrainian attacks on Russian oil refineries compounded the global diesel shortage in 2026, according to OilPrice. Russia, a top exporter of diesel, banned fuel exports through October 2026, contributing to tight global diesel inventories, according to Reuters. A possible U.S. ban on diesel exports was under discussion in late September, according to Reuters.

Chokepoint arithmetic

Hormuz sits between Oman and Iran, according to the EIA. The U.S. Energy Information Administration identifies it as the world's most important oil transit chokepoint, according to the EIA. Flow averaged 20 million barrels per day in 2024, or about 20% of global petroleum liquids, according to the EIA. Earlier baselines were slightly higher. Flow averaged 21 million barrels per day in both 2022 and 2018, or about 21% of global petroleum liquids consumption in each year.

An estimated 89% of the crude oil and condensate that moved through Hormuz went to Asian markets in the first half of 2025, according to the EIA.

The broader context here is a market with two clearing mechanisms. One is Hormuz transit and bypass use. The other is secondary logistics: refinery runs, product export licenses, clean tanker availability. Throughput and willingness to accept war risk explain the first. Crude recovery alone does not clear product shortages. Product shortages can lift flat price even when wellhead supply looks adequate, which is why pump and heating costs can stay high while crude looks plentiful. Freight, insurance and refinery decisions in Asia absorb most of the disruption premium.

In my view, it helps to separate the two risks. Strait risk is binary and headline driven. Attacks, truce talks, rerouting. Product risk is cumulative. Lost Russian runs, export bans, thin conversion capacity. The first moves volatility. The second sustains backwardation, when fuel for immediate delivery costs more than fuel for later delivery, and supports refining margins, the profit from turning crude into fuel, while crude length rebuilds. Until conversion capacity normalizes, Middle East export volumes will tell only half the story.