Oil edges higher after Trump rejects Hormuz reopening plan; diplomacy caps gains

Crude is still being moved by headlines, and the day's trading band shows how fast both optimism and setbacks over Iran diplomacy are being priced in. The tone of the mediated talks is the biggest variable: a credible path to reopening Hormuz could send prices sharply lower, while a collapse would likely take supply risk back towards the early-session highs. Physical tightness keeps downside moves limited, with strait flows still trailing pre-conflict levels and freight costs at records adding to delivered prices. The widening Brent-WTI spread and the US discussion over diesel exports point to product tightness, not just crude supply, now shaping price relationships.

Oil ended the session modestly higher after a choppy day, with Iran peace headlines keeping gains in check while undersupply and surging diesel costs propped up prices.

Summary:

• Brent ended roughly 1% higher, near $105 a barrel, while WTI gained about 20 cents to around $93. Earlier, prices had spiked by more than $4 after Trump dismissed Iran's idea for reopening the Strait of Hormuz.
• The advance eroded on expectations that Qatari mediators would meet separately with Iran and the US on Monday or Tuesday. Mixed signals about a potential nuclear accord dragged WTI and Brent down to around $91 and $96 at one point.
• September crude exports from Middle East producers recovered to close to 13 million bpd, the strongest since the conflict started in February. UBS, however, said volumes are still under pre-war levels and the market remains undersupplied.
• To offset record freight costs, Saudi Aramco may offer discounts of about $9 a barrel on crude loaded off Oman.
• The White House is weighing broader sales of red-dyed diesel to cool fuel prices, while chatter about a possible diesel export ban lifted the Brent premium over WTI to its widest since May.

On Monday, oil settled a touch higher, with supply concerns trumping expectations of a diplomatic deal after President Donald Trump turned down Iran's proposal to reopen the Strait of Hormuz. Brent gained about $1, roughly 1%, to close near $105 a barrel, and US West Texas Intermediate added about 20 cents, ending around $93.

Trading was volatile. After Trump rejected the proposal, crude climbed more than $4 a barrel in early action, then surrendered those gains on expectations that Qatari mediators would hold separate meetings with Iran and the US. An official familiar with the negotiations told Reuters the mediators were expected to meet Iranian Foreign Minister Abbas Araqchi in New York and the US side on Monday or Tuesday, with discussions focused on a revised version of a seven-day proposal Iran had put forward on the margins of last week's UN General Assembly. Confusion then mounted. A report claiming Iran would stop enrichment in return for relaxed US sanctions pushed WTI and Brent to lows around $91 and $96, but follow-up reports described the chances of agreement as extremely slim, with wide gaps and major hurdles. A US official said discussions were proceeding through intermediaries and that the nuclear issue had to be addressed for any agreement, while Trump was said to be open to easing sanctions and freeing frozen Iranian assets if progress was made. Reports also indicated Araqchi had not extended his stay in New York, and Trump told Axios on Sunday he expected further talks this week. Saudi Foreign Minister Prince Faisal bin Farhan, meanwhile, arrived in Washington to meet Secretary of State Marco Rubio as tensions grew between Riyadh and the Houthis, who are backed by Iran.

On supply, preliminary data from Kpler showed exports by major Middle East producers rebounded in September to nearly 13 million bpd, the highest since February's outbreak of war, as Saudi Arabia and the UAE shipped more. Hormuz loadings were heading for about 7.5 million bpd this month. After attacks damaged its East-West pipeline, Saudi Arabia shifted exports from Yanbu to Ras Tanura; a separate report saying the pipeline had returned to service put pressure on prices. UBS noted that despite more vessel movements, flows are still short of pre-conflict levels, leaving the market short of supply. Before the US and Israel attacked Iran in February, roughly 20 million bpd, or about a fifth of global oil supply, moved through the strait. Separately, Saudi Aramco is mulling cuts to official selling prices for crude lifted off Oman, with talks with Asian refiners about second-half October cargoes centering on a possible discount of around $9 a barrel.

Fuel costs were the other concern. During the session, futures slipped into negative territory at one stage as the Trump administration moved to bring down diesel and gasoline prices. According to sources, the White House is weighing regulatory relief to allow broader sales of red-dyed diesel, and the US Transportation Department has finalized sharply lower vehicle fuel economy standards. With diesel prices at records, talk of a potential US export ban on the fuel has pushed the Brent premium over WTI to its highest since May — the third time in four sessions — a signal that the market expects US refiners to run less crude if diesel is kept at home. Goldman Sachs said Europe and particularly Latin America are the main destinations for US diesel exports, and that a tightening shock would probably spread quickly around the world. Diesel prices have jumped on supply disruptions linked to the wars in the Middle East and Ukraine, as well as export restrictions in Russia and China. Moscow introduced its ban to safeguard domestic supply after Ukrainian strikes on refineries; Ukrainian President Volodymyr Zelenskiy said Ukrainian forces attacked Russian oil facilities in the Krasnodar region on Monday.

The focus now shifts to whether the Qatari-mediated discussions yield any change on the Strait of Hormuz, and how Saudi export flows and US diesel policy evolve.