Oil Prices Surge Amid U.S.-Iran Tensions as Diesel Margins Reach Record Highs

Rising geopolitical tensions between the United States and Iran have pushed global crude prices upward, dimming hopes for peace in the Middle East. Simultaneously, the U.S. diesel crack spread has reached an unprecedented milestone, exceeding $100 per barrel for the first time.

Brent crude rose to $91.33 per barrel, while West Texas Intermediate climbed to $85.08 per barrel. This price surge followed Iran’s announcement of a “fully offensive” strategy against the U.S. after peace negotiations collapsed.

The escalatory rhetoric intensified after the U.S. declined to prolong a brief ceasefire established in June. A senior Iranian official warned that Tehran is prepared to escalate tensions in the strategic Strait of Hormuz and the broader region. Adding to the volatility, President Trump threatened military action against Oman if it proceeds with a joint agreement with Iran to manage the Strait of Hormuz.

This geopolitical instability has exacerbated a global fuel supply squeeze. The record-high U.S. diesel crack spread reflects a tightening market, driven in part by a year-over-year decline of 5 million barrels per day in global refinery run rates, which averaged 80.9 million bpd according to the International Energy Agency.

Diesel supplies were already constrained after refiners prioritized gasoline and aviation fuel during the summer travel peak. The shortage has been further intensified by Ukrainian drone strikes on Russian refining infrastructure. In response to domestic fuel deficits caused by these attacks, Russia—one of the world’s leading fuel exporters—has suspended diesel exports through the end of the year.