Refining Margins Hold Firm Even as Crude Slips on Iran De-escalation
U.S. wholesale diesel futures jumped 26% in July alone, signaling product markets are tightening faster than crude prices suggest.
U.S. wholesale diesel futures surged 26% through July (2026-07-28), even as ICE Brent crude front-month eased to $79.42 a barrel on Tuesday (2026-08-04) following signals of de-escalation in the U.S.-Iran conflict. The divergence is striking: crude is softening on geopolitical relief, but the product markets underneath it are moving in the opposite direction.6
Crack spreads, the margin refiners earn processing crude into fuels, had reached $70 a barrel as of mid-July (2026-07-17), according to Bloomberg Surveillance. That reading tells a different story than the crude print alone. Refiners may be collecting their best margins in years, but the spread is wide precisely because buyers cannot find enough fuel, not because feedstock is cheap.4,3
The supply crunch has roots in what happened between March and April. Observable global oil stocks fell by a cumulative 246 million barrels over that span — 129 million barrels in March and another 117 million in April — a combined drain running at roughly 3.9 million barrels per day, according to OGJ analysis. Strip out barrels stranded in Gulf storage or aboard tankers unable to transit the Strait of Hormuz and the effective draw was steeper still.1
Global refinery crude runs in 2026 are now expected to average around 82 million barrels per day, nearly 1.6 million barrels per day below 2025 levels, OGJ reported. Less crude flowing into refineries means less product coming out. U.S. commercial oil stocks remained 6% below the five-year seasonal average as of the week ending July 17 (2026-07-17), with Cushing, Oklahoma, and the Strategic Petroleum Reserve sitting at multi-year and four-decade lows, respectively.6,1
Europe's exposure is more acute in jet fuel. Around 75% of the continent's jet fuel imports originate in the Middle East Gulf, meaning the Hormuz disruption translated almost immediately into an aviation supply shock. European diesel inventories are heading toward multi-year lows, Morgan Stanley analysts wrote in a note, describing conditions as "genuinely tight." The combination of disrupted import routes and depleted stocks has pushed refining margins sharply higher across the region.5,1
The crude market's reaction to Iran de-escalation has been predictable — prices pulled back as traders priced in the possibility of more barrels reaching market. But the product markets are telling traders that the upstream relief will take time to flow through. Rigzone reported that supply-chain bottlenecks are still rippling through global markets even as some Hormuz traffic resumes, and crack spreads are reflecting exactly that lag.3
ULSD heating oil front-month settled at $3.76 a gallon on Tuesday (2026-08-04), a minor pullback on the day but still elevated relative to the crude complex. Contrarian signals in the market are tilted bullish on ULSD, driven by policy factors — export restrictions and strategic stock management in several consuming countries have limited how quickly product can move to where it is needed most.6
Brent and WTI are now well below the crisis peaks, but that gap between crude softness and product tightness is where the real trading question sits. If Iranian crude production recovers toward 3.1 million barrels per day by August (2026-08) and approaches 3.3 million barrels per day by year-end as some analysts project, refiners should eventually see improved feedstock access. But refinery crude runs would need to recover meaningfully before inventories rebuild enough to compress margins.2
The path is not smooth. Analysts note that sustained confidence in Hormuz passage — not a single week of improved tanker traffic — is what would allow energy trade flows to fully normalise. One week of data does not restock months of depleted inventories or rebuild the jet fuel supply chains serving European aviation.2
For traders watching the products complex, the forward curves bear scrutiny. Diesel futures pricing product shortages months out while crude edges lower on diplomacy is an unusual setup. Whether refinery throughput recovers fast enough to close that gap before seasonal demand peaks in the fourth quarter is the figure worth tracking in the weeks ahead.6,3