A pipeline restarts and nobody outside Aramco can say how much oil is in it. Brent trades near $100 while cargoes of physical North Sea crude have changed hands above $130. The crude picture really is murky. The diesel picture is clear, and Britain, which imports most of its diesel and nearly all of its jet fuel, is now waiting on a decision in Washington.
UKOilWatch · 30 September 2026 · OilWatch Network Analysis
On 22 September Saudi Arabia restarted the East-West pipeline, the line that carries its crude to the Red Sea and around the Strait of Hormuz. Brent fell more than $2 on the news, towards $97.
Eight days later almost nothing about that pipeline is agreed. Bloomberg and the Wall Street Journal, citing people familiar with the matter, put flows at about 3.5 million barrels a day. Analysts working back from export loadings at Yanbu put them nearer 2.2 million. The rate before the drone strikes of 10â11 September is quoted at 4 million, at 5.5 million and, in one report, at about 7 million, which is the line's stated capacity. Riyadh blames an Iraqi militia; other reports say the Houthis. Aramco has published no figure of its own.
The market priced the restart in an afternoon and still cannot measure it.
This is the fog of war, the old military term for the uncertainty, friction and deception that hide the real state of a fight while it is under way. In 2026 it has settled over refineries, pipelines and tanker lanes, but unevenly. It is thickest over crude, where every figure comes in three versions. It is thin over diesel, where every figure points the same way. Most of the coverage, and most of the price action, follows crude.
Crude: three versions of every number
Start with volumes. The International Energy Agency's September Oil Market Report puts total Gulf oil exports at about 13 million barrels a day in August, roughly half the pre-war level. That is a recovery from the spring, when the Strait was all but shut. It is also lower than June, when a short-lived ceasefire lifted exports to 16.1 million barrels a day before hostilities resumed in early July. Whether exports are "recovering" depends on the month the comparison starts from.
Then the counting. Tankers switch off their transponders, cargoes move ship to ship, escorted convoys are only partly visible, and CENTCOM, Kpler, TankerTrackers and IMF PortWatch each count a slightly different object. Two reputable trackers can publish different totals for the same day without either being wrong. "Ten vessels were observed" is a statement about a dataset. "Ten vessels crossed" is a statement about the Strait, and the first does not establish the second.
Then the price. Brent futures stood at about $100 on Tuesday afternoon. Dated Brent, the price of physical North Sea cargoes, reached $113 on 9 September and was reported above $130 the following week, the week Aramco told European term customers that their October allocations were zero. A futures price carries expectations about diplomacy as well as barrels. Iran's foreign minister received Washington's response to a seven-day confidence-building plan through Qatari mediators in Doha on Tuesday and is due to discuss it in Tehran today. President Trump publicly rejected Iran's proposal last week, and the reported sticking point is the order in which each side moves. Any of that can shift Brent by several dollars before one additional tanker sails.
Diesel: one version
The product numbers leave far less room for argument. In August, the IEA reports, refined product and LPG exports from the Gulf were still nearly 60% below February, a loss of 3.7 million barrels a day. Gulf net exports of diesel and gasoil averaged 390,000 barrels a day, just over a quarter of the pre-war level. Add Russia, and the two regions that supplied almost 45% of the world's seaborne diesel in February were exporting 1.6 million barrels a day less of it.
Russia's part of that shortfall is now policy. Moscow confirmed today that its ban on diesel exports by producers runs to the end of October. The ban has been extended repeatedly since it was imposed in July, and in mid-September three of the country's six largest diesel refineries were reported shut or running at about a quarter of capacity after Ukrainian drone strikes.
Prices have followed. US diesel passed $200 a barrel in early September, 94% above its pre-war level, when Brent was up 45%. Atlantic Basin refining margins set records in August, and the agency's own description of the global refining system is "stretched to the limit". Observed stocks have fallen by 507 million barrels since the war began, and the draw is accelerating: 3.1 million barrels a day in August against a wartime average of 2.8 million.
The difference is physical. Crude has substitutes in bypass pipelines, naval escorts, Atlantic barrels and strategic reserves. A damaged refinery has none on any timescale that helps this winter, and an emergency stock release is yesterday's barrel consumed today. The IEA's own split shows the result: by August the Gulf's crude export losses had narrowed to just under 45%, while its product losses were still near 60%.
The chokepoint in Washington
The gap has been filled largely from one place. The United States exported a record 1.6 million barrels a day of diesel in August, up from about 1 million in February, which makes the Gulf Coast the source of roughly a fifth of all diesel traded by sea. Kpler lists the top buyers as Brazil, Chile, Mexico, Peru, Morocco, France and the United Kingdom.
That supply has become a campaign issue. American pump diesel averaged $6.382 a gallon in the week to 28 September, easing from a record $6.529 the week before but still about $3 more than a year earlier, and the midterm elections are five weeks away. Farm-state Republicans have called for an export embargo. Trump said on 27 September that a ban was under serious consideration. Politico has reported a plan for a 90-day halt, the White House says no decision has been made, and the energy secretary, Chris Wright, opposes an outright ban but has sounded out refiners on voluntary limits.
Most analysts expect a ban to fail on its own terms, because storage would fill, refiners would cut runs and petrol output would fall along with diesel. That is an argument about American prices. For importers the matter is simpler. The supplier of last resort would have closed the door on the one product for which nobody else has spare capacity.
Where it lands
Britain
On government figures the UK imported 59% of its diesel and 88% of its jet fuel in early 2025, and that was before Grangemouth and Lindsey stopped refining. Four refineries remain, none of them in Scotland. Britain is on Kpler's list of the largest buyers of American diesel, so a restriction in Washington would reach hauliers, farms and forecourts as cargoes that fail to arrive, with the price effect on top.
Europe
The continent is short on both legs. On crude, Aramco's October allocations to European term buyers are zero. OECD Europe took 577,000 barrels a day of Saudi crude in June, typically delivered through Egypt's SUMED line to the Mediterranean, and Poland's Orlen has been tendering for North Sea, American and Kazakh barrels since mid-September. On products, the Gulf diesel that Europe turned to after it banned Russian supply in 2023 is the diesel now missing. France is on the Kpler list too, which means Europe and Latin America are bidding for the same Gulf Coast cargoes.
The Americas
The United States is the world's largest oil producer and is paying record prices for diesel, as clear a demonstration as any that crude abundance and product security are different things. South of it the dependence is direct. American diesel covers about a third of Latin American consumption, according to S&P Global. Its share of Brazil's demand rose from 5.5% across January to July to 13.2% in August, and Mexico entered the autumn with low inventories, according to the Atlantic Council. A Brazilian harvest and a Mexican trucking fleet now sit downstream of a White House decision as well as a Saudi pumping station.
What is established and what is not
| Established | Gulf diesel exports at about a quarter of pre-war. Russia's producer export ban in force to 31 October. Global stocks down 507 million barrels. US diesel exports at a record. |
| Measured imperfectly | Tanker transits through Hormuz. East-West throughput, somewhere between 2.2 and 3.5 million barrels a day. Total Gulf exports, about 13 million barrels a day in August and subject to revision. |
| Inferred | That the fall in Brent since early September reflects talks more than barrels. That crude is healing faster than products. |
| Unresolved | US export policy. Whether the seven-day plan survives the argument over sequencing. Whether the pipeline is back at full rate by mid-November, as the six-to-eight-week repair estimates imply. Where the next strike lands. |
Our read
Until diesel margins fall, a crude headline proves nothing about fuel supply in either direction. A lower Brent price, a restarted pipeline and a hopeful communiqué are all consistent with a products market that has not improved at all. The largest near-term risk to physical supply in all three regions this network covers is a restriction on US exports, and no tanker tracker will show it until the cargoes fail to load.
Five things would change that read:
- Washington. Any export limit, formal or voluntary. Watch weekly Gulf Coast distillate liftings rather than the statements.
- Aramco's November allocations to Europe. If they are restored, the pipeline is really back. If they are not, 3.5 million is the optimistic number.
- Diesel margins against crude. If Brent falls on talks and cracks do not follow, nothing physical has changed.
- 31 October. Whether Moscow lets the export ban lapse. It has not done so yet.
- The stock draw. A second month above 3 million barrels a day would mean the buffer is being spent faster as it shrinks.
OilWatch's live boards follow the same rules as this piece. A transit count is published with who observed it, over what window, and whether dark, escorted and bypass barrels are included. A restart is published with its rate. Revised estimates stay visible beside the figures that replaced them. Where two reputable sources disagree we publish both, because in this war the gap between them is part of the data.
The OilWatch network (UKOilWatch, EuroOilWatch and AmericasOilWatch) independently monitors oil supply, reserves, prices and physical disruption.
Sources
- IEA, Oil Market Report, September 2026 and July 2026
- East-West pipeline: Bloomberg, 28 Sept; AGBI, 29 Sept; ThePrint, 28 Sept; Reuters via Express Tribune, 22 Sept; Quartz, 22 Sept
- Saudi October allocations to Europe: OilPrice, 18 Sept; TĂŒrkiye Today
- Talks: Reuters via Investing.com, 30 Sept
- Russian export ban: Asharq Al-Awsat, 30 Sept; OilPrice, 16 Sept
- US diesel exports and the ban debate: Reuters via BOE Report, 23 Sept; CNBC, 28 Sept; Vantage Markets, 29 Sept; American Action Forum; Atlantic Council
- US retail diesel: EIA Weekly Retail Gasoline and Diesel Prices, week ending 28 September 2026
- Brent: Fortune, 29 Sept
- UK import dependence: S&P Global, July 2025