Iran War Premium Fades as U.S. Crude Drops to Multi-Year Lows
Claire Weston
Crude flows through the Strait of Hormuz have resumed, erasing the war premium that inflated U.S. oil prices. Mars sour crude has dropped to its lowest since January 2023, now $3/bbl below futures — versus a nearly $18/bbl premium at the war's peak. The entire U.S. crude pricing complex is resetting to pre-war levels.
How fast did the premium evaporate?
Mars crude — the U.S. medium-sour benchmark — traded at a $3/bbl discount to NYMEX futures this week. At the war's peak in late March, the same grade commanded a premium of nearly $18/bbl. This means → a $21/bbl swing was wiped out in under two months.
Houston Gulf Coast crude prices fell to their lowest since the Covid pandemic.
Permian Basin crude in Texas traded below futures for most of last week; Thursday's discount was the widest since 2020. At the war's peak, the grade had carried a premium of nearly $8/bbl.
What is driving the collapse?
Neil Crosby, head of research at Sparta Commodities, told Bloomberg: "The entire market is weakening. As more medium-sour crude flows out of the Strait of Hormuz, U.S. and Latin American grades are coming under pressure."
In plain terms = during the war, buyers were forced to substitute U.S. crude because Persian Gulf shipments were disrupted. Now the strait is open again, and that substitute demand is unwinding.
The WTI–Brent spread has narrowed, further squeezing the arbitrage window for U.S. crude exports.
What is the inventory data signaling?
EIA data showed Cushing, Oklahoma storage rose for the first time in 10 weeks — but remained below the unusually low threshold of 20 million barrels.
Total U.S. commercial petroleum inventories sit at their lowest since March 2025. Including government reserves, crude stocks are at their lowest since 1984.
This means → absolute inventory levels are still tight, yet prices are not finding support — because the market sees demand retreating faster than stocks can rebuild.
Why are Asian buyers suddenly reversing course?
Asian refiners bought heavily from the U.S. during the war. With Persian Gulf supply restored and freight rates rising, they are now cutting U.S. crude imports.
Some Asian refineries are even trying to resell previously purchased U.S. cargoes back into the American market. In plain terms = weeks ago the U.S. was the world's crude "buyer of last resort"; now the roles have flipped entirely.
U.S. crude exports fell to their lowest since late March last week, averaging roughly 4 million bbl/d — down sharply from a peak of about 6.5 million bbl/d in late April.
Will the strategic reserve release keep adding pressure?
The U.S. is still proceeding with plans to release all 172 million barrels of its Strategic Petroleum Reserve. Similar-quality reserve crude entering the market adds further pressure on Mars pricing.
Refilling the reserve is expected to take several years, but the core driver of recent inventory drawdowns — wartime export demand — has already snapped back to pre-war levels.
This reflects a key question for the next phase: not whether inventories are tight in absolute terms, but whether the expected supply surplus will show up faster in actual inventory data.
Content is for reference only, not financial advice.