Will Diesel Crack Spreads Break $35 as Russian Refining Collapses?

WAR IS A terrible thing for refining margins. Or so the old logic went. When conflict disrupts supply, crude prices spike, input costs rise, and the spread between what refiners pay for oil and what they earn from selling fuel — the crack spread — gets squeezed from both sides. The past few months have turned that logic on its head.

Russia's seaborne exports of refined petroleum products fell by a third in July, to 3.9m tonnes, according to data from LSEG and market sources compiled by Reuters. Diesel and gasoil shipments collapsed by 60% month on month, to just 0.75m tonnes. The Kremlin has extended its ban on diesel and gasoline exports through January 31st 2027. Ukrainian drone strikes on Russian refineries and export terminals have reduced crude-processing rates. Moscow is no longer a swing supplier of transport fuels to global markets. It is becoming a net importer.

The effect on refining margins globally has been electric. The 3:2:1 crack spread — which measures the profit from turning three barrels of crude into two of gasoline and one of diesel — has hit record levels, surpassing the peaks of the 2022 energy crisis, according to Forbes. The gap between crude and fuel is the story.

The structural backdrop makes this disruption harder to shrug off. Global refineries are running at near-maximum utilisation. Amin Nasser, the chief executive of Saudi Aramco, said on August 4th that the system has "no spare capacity". Darren Woods, his counterpart at ExxonMobil, told Politico that the shortage could have "significant impact on consumers and people's pocketbooks". When the next unplanned outage occurs — and it will — there is no plant sitting idle to compensate.

The nature of the disruption matters as much as its scale. Russian crude exports have actually risen, reaching 4.32m b/d in July, their second-highest monthly reading of 2026. What has collapsed is the country's ability to process that crude into finished products. Baltic clean-product terminals at Ust-Luga and Primorsk are running at very low levels. The composition of Russia's seaborne trade has shifted from products to crude, a structural change that will not reverse quickly. Even if some damaged refineries are patched, the export ban through January 2027 signals that the Kremlin expects domestic supply to remain tight for months.

The market has hardly been asleep to the opportunity. The obvious question is whether the trade is already stale.

It is not. The risk the market is under-pricing is not the level of margins but their duration. The instinct is to treat this as a cyclical peak — a spike that will fade as geopolitical tensions ease or demand softens. The evidence suggests otherwise. The Russian export ban is not a temporary measure. The global spare-capacity buffer, which historically capped margins during disruptions, has been eliminated by years of underinvestment, permanent closures and war. Every week of lost Russian throughput transfers market share and margin to every non-Russian refiner that can still operate.

The asymmetry is on the upside for three reasons. First, the supply-demand balance in middle distillates will remain structurally tight as long as Russian refining capacity is impaired and the export ban is in place. Second, the disappearance of spare capacity means that margins are less responsive to crude-price moves than in previous cycles — cheaper crude widens the crack rather than triggering a competitive response. Third, product supply is shrinking even as the world economy, however tepidly, continues to consume fuel.

The break conditions are clear and worth watching. If Russia restores significant refining capacity within weeks, the thesis weakens. But the export ban extending through January 2027 makes that unlikely in the near term. The more material risk is demand destruction: sustained high diesel and gasoline prices could eventually reduce consumption, particularly in price-sensitive emerging markets, and in freight and logistics, where diesel costs are a direct operating expense. No sign of that has yet appeared in the data.

The second-order effects extend beyond the refiner's bottom line. High diesel prices are an invisible tax on the broader economy. They raise costs for trucking, groceries, building materials and consumer goods. They complicate central-bank inflation forecasts, since refinery margins — not just crude prices — determine pump prices. The Federal Reserve and other central banks may find that energy inflation persists even as headline crude prices soften, because the bottleneck has moved from the wellhead to the refinery gate.

For investors, the choice is not whether to own refiners. It is whether the market is pricing a quarter or a cycle of elevated margins. The export ban, the capacity destruction and the structural shift in Russian trade all point to the latter. The asymmetry is to the upside until the break conditions are met. The refining windfall is not a trade. It is a structural transfer of margin from the world's most disrupted refining system to every other refinery still standing.