Goldman's $63 Diesel Forecast Rests on a Product-Flow Recovery Still Half That of Crude
Persian Gulf product shipments sit at 40% of pre-war levels while crude has recovered to nearly 80% — a gap that the refining margin headline doesn't resolve.
Goldman Sachs more than doubled its diesel refining margin forecast on Monday (2026-08-31), lifting the estimate toward $63 a barrel as sustained drone strikes on refineries in the Middle East and Russia continue to drain global petroleum product supplies, the bank said in a note reported by Rigzone.7,6
The upgrade has focused attention on crack spreads and refinery earnings. Sitting beneath that headline is a structural divergence in how crude flows and product flows have recovered from the Hormuz crisis, with implications for how long and at what level these margins persist.
Goldman analysts noted in late August (2026-08-31) that while crude oil exports from the Persian Gulf had returned to between 70% and 80% of pre-war levels, shipments of refined products remained at only 40%.7 That gap between crude and product recovery rates reflects refinery damage, not a crude access problem. Product supply depends on the pace of refinery repair and reconstruction, with Strait of Hormuz flow normalization a secondary variable.
Goldman's own figures show global exports of refined petroleum products are down 4 million barrels daily from pre-war levels, with the Middle East alone accounting for 2.5 million barrels of that decline.1 Russian diesel output fell 10% in May 2026 after another 10% drop in April 2026, Reuters estimated, adding a European supply dimension to what is largely framed as a Gulf story.1
Markets have been treating US refining capacity as the pressure relief. The data point elsewhere. Energy Department figures for the week of August 3, 2026 showed US distillate exports at a record of nearly 2 million barrels, on top of domestic consumption running close to 3.5 million barrels a day.5 Maximum domestic output is capped near 5.3 million barrels a day, leaving no incremental volume available. Gulf Oil's Tom Kloza put wholesale diesel at $180 a barrel — roughly $90 above the mid-$80s cost of crude — and warned that a Gulf hurricane could push that figure past $200.5
Goldman published a crude surplus forecast alongside its diesel margin upgrade. The bank cut its Q4 2026 Brent estimate to $80 a barrel from $90, projecting a surplus of more than 3 million barrels a day as non-OPEC supply recovers and Iran tensions ease.2,3 ICE Brent crude front-month was at $94.97 a barrel as of September 5, above Goldman's own Q4 target. A crude surplus, if it materialises, compresses refiner input costs and mechanically widens crack spreads further, unless diesel demand softens in parallel. Goldman separately estimated Brent could top $120 a barrel next quarter if Hormuz disruptions persist.4
Global refining capacity is already short by an estimated 7 to 9 million barrels a day, according to Kloza, a gap deepened by Venezuela's prolonged production decline and Latin America's structural dependence on US distillate supply.5 Diesel margins were running two to three times higher than their 2013-to-2019 average before Goldman's latest revision, the bank said in a note around June 1, 2026.1
Goldman expects Strait of Hormuz throughput to recover to only about 70% of pre-war levels.3 If crude exports approach 80% of pre-war levels while refined product shipments stay near 40%, the shortage becomes a refinery reconstruction problem, with a timeline set by physical repair schedules in the Middle East rather than by diplomatic progress in the Strait. Weekly Energy Department distillate export data and Persian Gulf product loading figures are where evidence of that gap's direction will first appear.7