Dear Readers,
September felt like a market trying to catch its breath without fully letting its guard down.
The sharpness of summer began to ease in some areas, but the market never felt careless. There was more balance in crude than earlier in the season, but the physical fuel side still required attention. Bunkers remained tied to route changes, port behavior, and buyer confidence. Fuel oil continued to remind the market that the heavier side of the barrel has its own rhythm.
That made September less about one big move and more about adjustment.
The market was not chasing panic. It was recalibrating.
Some parts of the system looked better supplied. Some were still thin. Some buyers had more options, while others still needed to plan carefully around timing, location, and product fit.
September was a month where the headline looked calmer than the details. And in fuel markets, the details are usually where the real story lives.
Crude Oil Market Overview
The crude market in September moved from high summer intensity toward a more balanced position.
At the start of the month, refinery activity was still very strong. Crude inputs were around 17.6 million barrels per day during the September 4 week, with utilization near 97.8 percent. That is a heavy operating pace and showed that refiners were still pulling strongly on crude heading into the month.
By the following week, crude inputs eased to about 17.3 million barrels per day, with utilization moving slightly lower. By the September 18 week, refinery crude runs stepped down further to roughly 16.8 million barrels per day, and utilization moved to about 94.0 percent.
That shift matters, but it needs to be read correctly.
This was not a sign that refiners were broadly backing away from the market. Runs came off the early-month peak, but they remained strong by normal standards. Diesel economics, export demand, and product margins continued to give refiners reason to keep units running where possible, even as the market moved out of the heaviest summer pull.
The bigger change was the crude cushion.
Stocks were near 424.1 million barrels in the September 4 week, roughly in line with the normal seasonal average. They moved to about 423.4 million barrels the next week, slightly above normal, and then increased to about 426.4 million barrels by the September 18 week, around 2 percent above normal.
That gave crude a different tone than July and early August.
The market was not loose, but it was no longer living on the same tight cushion. Refinery demand remained healthy, but the crude side had more cover underneath it.
Imports helped shape that balance as well. Volumes were strong early in the month, then stepped down by mid-September. Even with that change, crude inventories still finished the period in a better position than they had through much of the summer.
So the crude story for September was not one of stress.
It was one of transition.
The market moved from peak summer pressure toward a steadier footing, with crude cover looking more comfortable while refiners still had reason to stay active.
Bunker Fuel Insights
The bunker market in September was not defined by shortage. It was defined by adjustment.
Earlier in the year, the biggest question was whether disruption around key shipping routes would create a real marine fuel supply squeeze. By September, the market had adapted better than expected. Buyers were still paying attention, but the sense of panic had faded.
That does not mean the market became easy.
Bunker prices remained firm, and expectations for forward pricing stayed elevated. The market was still carrying risk premium from crude, freight, routing changes, and regional uncertainty. But the fear of not being able to secure fuel had eased in several major areas.
Singapore continued to stand out.
The port remained strong even with ongoing disruption around traditional trade flows. That tells us bunker demand did not disappear. It shifted, adjusted, and kept moving through the hubs that had the supply depth, infrastructure, and reliability buyers needed.
Fujairah was a different story.
Activity there remained well below prior-year levels, showing how much regional disruption can change the behavior of a major bunker hub. Even when the broader market finds ways to adjust, individual ports can still feel the impact for much longer.
That was one of the bigger bunker lessons in September.
The global market can look supplied while certain hubs remain under pressure.
For buyers, that kept the focus on more than just price. Port choice, supplier reliability, timing, and quality all mattered. A stem still had to match the vessel’s route, schedule, and operating needs.
September bunkers were calmer than the earlier disruption period.
But calm is not the same as simple.
The market had adjusted, not normalized.
Fuel Oil Sector Highlights
Fuel oil strengthened through September, especially on the residual side.
U.S. residual fuel oil inventories moved from about 22.0 million barrels in the September 4 week to about 23.0 million barrels the following week, then increased again to roughly 23.7 million barrels by the September 18 week. That was a steady build across the first three weeks of the month.
The Gulf Coast carried much of that improvement.
Residual stocks there moved from about 12.6 million barrels to about 13.6 million barrels, then to roughly 14.1 million barrels by mid-month. That helped improve the national picture and gave the heavier side of the barrel more support than it had in some earlier periods.
The East Coast was steadier, holding near the 5 million barrel range during the same stretch. That kept the regional picture from feeling overly tight, but it did not change the broader point: fuel oil was improving, but still not overflowing.
The two-year comparison remains important.
Even after the September build, residual fuel oil inventories were still below where they stood two years earlier. That means the market improved, but it did not create a large surplus cushion.
High sulfur material also became more relevant during the month. The heavier sulfur category built from the first week to mid-month, with the Gulf Coast continuing to hold the largest share. That matters because HSFO demand remains tied to scrubber-equipped vessels, blending economics, and bunker market behavior.
Fuel oil in September was not tight in the same way it had been earlier.
It was rebuilding.
But it was rebuilding from a lower base, and the market still cared about crude slate, refinery priorities, and regional availability.
That made fuel oil one of the more constructive parts of the September picture.
Not loose.
But improving.
INTERESTING FACTS
- Bunker Markets Can Adapt Faster Than Expected
When one route becomes difficult, buyers and suppliers often shift toward ports that can provide more reliable coverage. - A Strong Bunker Hub Needs More Than Fuel
Storage, barges, testing, credit, scheduling, and supplier depth all help determine whether a port can handle demand. - Crude Balance Can Improve While Products Stay Uneven
A healthier crude position does not automatically mean every finished product or residual stream is comfortable. - HSFO Still Matters Because of Scrubbers
Scrubber-equipped vessels keep high sulfur fuel oil relevant in major marine fuel markets. - Fuel Oil Inventories Can Improve Without Feeling Loose
A build matters, but the starting point and seasonal comparison matter just as much. - Refinery Runs Can Stay Strong When Margins Support Them
Diesel economics, export demand, and product margins can encourage refiners to keep units running longer than they otherwise might. - The Gulf Coast Anchors the U.S. Fuel Oil Balance
Its refinery system, storage, and export infrastructure make it a major driver of residual fuel oil supply. - Fujairah Shows How Regional Risk Can Change Bunker Flows
Even major marine fuel hubs can lose activity when vessel routing and regional risk change. - Bunker Buying Is Still a Physical Market Decision
The cheapest price is not always the best option if timing, quality, or delivery reliability is uncertain. - Markets Can Calm Down Before They Fully Normalize
Lower panic does not always mean the system is back to normal. It often means the market has adjusted to a new pattern.
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FINAL THOUGHTS
September was a transition month.
Crude moved into a more balanced position as inventories held above normal seasonal comfort. Refinery runs came off the early-month peak, but remained strong enough to show that refiners were still responding to margin support and export needs.
But the rest of the system still needed attention.
Bunkers adjusted to ongoing route disruption, with major hubs behaving very differently from one another. Fuel oil improved as residual inventories built through the month, but the market still did not look overly loose.
That was the real September takeaway.
The market was calmer.
But it was not careless.
Supply improved in places. Timing still mattered. Regional differences still mattered. Product quality still mattered.
September did not bring a full reset.
It brought a more disciplined balance.
The Signal Fluid Solutions team would like to take this time to thank you for your business and thank you for allowing us to be an important part of you supply team.
Tyler Jordan – Oil Trading Manager – 909.203.0237