This year diesel did something no refined product had done before. The American crack spread — the premium of a barrel of diesel over its crude feedstock — touched $102 in August, roughly five times its normal level, and the European crack crossed $100 as well. For an energy investor, the obvious reading is bullish and simple: if refined products are this short, crude itself cannot be far behind, and Brent, which settled above $101 earlier this month, with banks projecting a $100–120 band well into 2027, looks like confirmation.
That reading fuses two machines that are not the same. The diesel crack is real, physical and already priced. The 2027 crude floor is a conditional forecast, and the evidence that would confirm it is quietly pointing the other way.
A refining crisis wearing crude's clothes
The diesel market is no longer clearing on price; it is clearing on availability. Roughly seven to eight million barrels a day of global refining capacity is offline — about five million in Russia, taken out by Ukrainian strikes, and around two million in the Middle East by drone attacks. Export bans and strikes compound the shortage: diesel and gasoil exports from Russia and the Middle East have roughly halved, from about 3.3 million to 1.6 million barrels a day, and Persian Gulf diesel exports are down 80% from a year earlier. Inventories sit below their five-year minimums, with American distillates about 12% below their seasonal five-year average.
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The tell that this is a product story, not a crude one, is that strategic reserves cannot fix it. The American Strategic Petroleum Reserve holds crude, not refined product; releasing it does nothing for a barrel of diesel that never existed because a refinery was bombed. The margin accrues to whoever owns the surviving capacity — Marathon and ValeroVLO-- more than doubled their per-barrel refining margins in the second quarter. This is an inventory and capacity gap, independent of any waterway, which is why it can persist even if shipping normalises.
A floor that is really an upside scenario
The crude leg is a different animal. The $100–120 band into 2027 is not a consensus forecast; it is an upside scenario dressed as a base case. Goldman Sachs's own December base case is Brent at $85, and $80 for 2027; it reaches about $100 only if Gulf output stays roughly four million barrels a day below pre-war levels, and it cites a separate adverse case near $120, with a downside to $80 if exports normalise. The "floor" becomes a floor only on fulfilment of a condition.
That condition is the asserted closure. Iran's Revolutionary Guards declare the Strait of Hormuz "completely closed" and under their control; the Houthis blockade Saudi ports and claim to have forced ten ships to retreat — a claim Reuters could not verify. These are the claims of belligerents, about waters the market is still, in part, traversing.
Watch what is actually sailing
The falsification metrics — freight rates, war-risk premia, transit volumes — are where priced reality separates from forecast. The shipping evidence has been stubbornly mild. Even as Houthi threats resurfaced, Suez traffic has been running elevated for two consecutive weeks, at levels not seen since the start of 2024, before the mass exodus from the Red Sea; Bab el-Mandeb transits ran 30% above a year earlier. No attacks were recorded after 24 August, and the market has come to treat the threat as limited to a narrow subset of Saudi-linked tonnage rather than a broad risk to the whole industry.
War-risk premia draw the same line, sharply. Hormuz, genuinely dangerous, commands premia of 7.5–10% of hull value against a pre-war baseline of 1–3%. The Bab el-Mandeb, through which ships still pass, is priced at 0.5%, falling below 0.1% once a vessel is out of Houthi range. The gap between those two premiums is the gap between a real closure and an asserted one.
Conflating the two legs is expensive in both directions. If the crude floor is genuine, then the diesel squeeze is a prelude to a longer, pricier supercycle, and paying up for crude-linked exposure is sensible. If, as the transit and premium data suggest, the closure is narrower than the belligerents claim — if carriers resume and premiums collapse — the crude floor fades toward Goldman's $80 downside even while the diesel crack persists, because a refinery destroyed in Russia or the Middle East is not restored by the reopening of a strait.
The two-trade discipline follows. The diesel leg is verifiable today and deserves to be held as the physical shortage it is. The crude floor is a forecast contingent on a contested closure, and should be gated — held only while the freight, transit and premium observables keep confirming real scarcity, and dropped the moment they stop. Paying the product's price while assuming you own the crude's is how the market injures investors who forgot to check which claim was being priced.
