Brent above $100 confirms the oil squeeze; $79 diesel cracks show where scarcity is being monetised
Brent crude crossed $100 a barrel on September 9 as renewed U.S.-Iran fighting and attacks on Gulf energy infrastructure tightened an oil system already short of refinery output. Brent reached $100.95, while West Texas Intermediate stayed below $96. For refining equities, the more consequential number is the European diesel crack, which recently reached $78.90 a barrel.
The comparison with recent history is stark. Diesel margins averaged about $21 a barrel in 2025 and $19.52 in 2024. That leaves the current crack almost four times last year's average, reflecting a shortage of usable refining capacity and product flows rather than crude prices alone.
The International Energy Agency estimated global refinery throughput at 80.9 million barrels a day in July, roughly 5 million barrels a day below a year earlier. Diesel exports from Russia, the Middle East and Asia were down about 1.3 million barrels a day year on year, close to one-fifth of seaborne diesel trade. Jet-fuel exports were lower by about 670,000 barrels a day. The product squeeze was already severe before Brent printed above $100.
A $79 crack is only valuable if the refinery can run
A benchmark crack spread measures the value of turning a crude barrel into a refined product. It does not tell investors what an individual refinery earns.
That difference is acute now. Plants configured around medium and heavy sour crude cannot always replace those barrels one-for-one with lighter supply from the U.S., Canada or Guyana without changing yields and economics. Gulf shipping disruptions further complicate access to both crude and finished products. (The Wall Street Journal)
The strongest earnings setup therefore belongs to plants that can secure compatible feedstock, stay online and tilt yields toward middle distillates. A refinery that cannot do those things may see much less of the headline margin.
The size of the opportunity is still striking. A $78.90 diesel crack is roughly $58 a barrel above the 2025 average. Multiplying that spread by a refinery's full throughput would be wrong because yields, crude slate, utilization, hedges and operating costs differ. But it shows how valuable each incremental barrel of diesel production has become.
Product availability matters more than another $5 in Brent
The supply route worsened again this week. U.S. forces said they destroyed five Iranian tankers after attacks on U.S. vessels, while Iran and Iran-backed forces widened retaliatory strikes. Reuters cited Rystad Energy estimates showing Hormuz oil flows had recovered to roughly 8 to 9 million barrels a day before fighting resumed on August 30, then fell below 2 million barrels a day. (Reuters via Investing.com)
Alternative routes are under pressure as well. Houthi attacks on Saudi energy facilities threatened flows through the Red Sea, raising the chance that crude struggles to reach refineries at the same time finished fuels become harder to replace.
For refining portfolios, the key test is operational rather than directional. Plants that can source the right crude and keep units running can monetize a diesel market that is paying an exceptional scarcity premium. If Gulf crude flows and regional refinery throughput normalize, that premium can collapse even if Brent remains high.
Sources
Reuters, Brent crosses $100 as Middle East fighting escalates
Financial Times, Brent reaches $100.95 and physical supply tightens
Wall Street Journal, crude-grade and refining constraints