Oil Surges Toward Weekly Gain as U.S. Iran Fighting Returns and Diesel Smashes Record

Oil prices headed for a powerful weekly advance on September 4 as military exchanges between the United States and Iran resumed during the seventh month of their conflict.

Escalating threats to regional energy infrastructure added a fresh geopolitical premium across crude and refined fuel markets.

Brent crude futures were up 6.1 percent for the week, while United States West Texas Intermediate futures had climbed 8.3 percent.

The gains reflected renewed concern that physical supply interruptions could deepen if fighting spreads across critical production and shipping routes.

Both benchmarks eased during the session as traders locked in some profits. Brent fell 75 cents, or 0.79 percent, to $94.77 a barrel by 1230 GMT, while WTI declined 95 cents, or 1.04 percent, to $90.35.

The crude rally has been overshadowed by an even sharper increase in fuel costs, particularly diesel.

That surge is feeding inflation, lifting government borrowing costs and intensifying warnings that the global economy could be moving toward a hard landing.

"All sectors of the economy are affected by diesel. This is one of the reasons why the government bond yields in the United States are so high, it's the expectation that inflation will continue to go up," said Claudio Galimberti, chief economist at Rystad Energy.

Average United States diesel prices reached record levels as renewed hostilities with Iran collided with Ukrainian attacks on Russian refineries.

The twin disruptions are tightening expectations for middle distillate supplies at a time when diesel remains essential to trucking, agriculture, construction, manufacturing and heavy industry.

Washington has said Middle Eastern oil movements returned to near normal levels in recent weeks.

Analysts and tanker tracking services dispute that assessment, arguing that regional flows remain seriously disrupted and that shipping conditions are still far from routine.

United States attacks during the week killed and wounded dozens of people, including Iranian civilians.

The strikes marked the fiercest clashes between the two countries since July and revived fears that energy installations could become direct targets.

Israeli Defence Minister Israel Katz renewed his warning that Israel would "cripple" Iran's military and civilian infrastructure if Tehran launched attacks.

Energy facilities were included in the threat, raising the stakes for a market already struggling to assess the security of regional production.

A United States campaign aimed at squeezing Iran's economy is also placing greater pressure on Tehran.

Three senior Iranian sources said the effort to blockade oil exports and prevent sanctions evasion was becoming increasingly difficult for the country to withstand.

Tim Waterer, chief market analyst at KCM Trade, said renewed fighting and persistent uncertainty surrounding the Strait of Hormuz had been "enough to reprice risk higher." The narrow waterway remains one of the most important transit corridors for global crude, condensate and liquefied natural gas supplies.

Only four commodity vessels passed through the Strait of Hormuz on Thursday, according to preliminary shipping information.

That volume was dramatically below the ten day average of about 15 vessels, reinforcing doubts about claims that traffic has largely normalized.

The shipping slowdown is especially significant because even temporary restrictions can remove large volumes from the readily available market.

Longer voyages, higher insurance costs and vessel delays can quickly raise delivered energy prices far beyond the immediate conflict zone.

Iraq increased oil exports in August to about 2.34 million barrels per day, according to two Iraqi energy officials.

That represented a substantial recovery from roughly 1.35 million barrels per day in July, but it was not enough to calm broader concern about regional availability.

Citi raised its average Brent forecast for the third quarter to $86 a barrel from $80.

The bank said the reopening of the strait was taking longer than previously anticipated, leaving the market exposed to persistent logistical strain.

ANZ analysts lifted their short term Brent forecast to $95 a barrel and warned that prices could move higher if the Middle East conflict intensifies.

With diesel already at record levels and vessel traffic severely reduced, every new military exchange now carries immediate consequences for energy costs, inflation and financial markets.