US commercial crude inventories increased by 922,000 barrels during the week ending September 25, reaching 427.3 million barrels, according to new data from the US Energy Information Administration (EIA).
The official increase was slightly lower than the preliminary estimate of 1.019 million barrels released a day earlier by the American Petroleum Institute (API).
However, the performance of refined products showed a different signal: distillate stocks decreased by 2.3 million barrels, remaining 14% below the five-year average for this time of year.
The divergence is significant because crude represents the raw material, while distillates, including diesel and heating oil, are products obtained after passing through the refining infrastructure.
The EIA reported that US distillate production averaged approximately 5.0 million barrels per day during the week, below previous levels, while distillate supply averaged 3.8 million bpd over the past four weeks, up 5.2% from the same period last year.
More Crude Does Not Mean More Diesel Available
The US balance thus shows a difference between the availability of raw material and the availability of finished products. The increase in stored crude does not automatically translate into higher diesel stocks, because distillation, conversion, treatment, storage, and distribution units are involved between these two points.
The EIA itself structures its statistics separately for crude inputs to refineries, capacity utilization, product output, inventories, and product supply, precisely because each stage modifies the energy balance.
The pressure on distillates also does not appear only in this week’s data. The EIA had projected that US inventories would remain below the bottom of the five-year range for much of 2026 and 2027, in an international market conditioned by lower distillate production in several regions and high US export levels.
Refining Infrastructure Comes into Play
To transform an additional barrel of crude into more diesel, simply having oil in tanks is not enough. The refinery needs available operational capacity and a configuration capable of producing the required yield.
Atmospheric and vacuum distillation units separate crude fractions, while conversion and treatment units allow these streams to be adjusted to obtain products that meet commercial and environmental specifications.
Therefore, an accumulation of crude can coexist with a reduction in distillate inventories. If available refining capacity, unit yields, maintenance, logistical constraints, or plant configuration limit transformation, the market may have oil at the source and simultaneously experience a tighter supply of certain fuels.
The Market Is Measuring Products, Not Just Oil
Total US petroleum product supplied averaged 20.8 million barrels per day over the past four weeks, up 2.1% from a year earlier.
In the case of distillates, the average supply increased by 5.2%. This means that the drop in inventories cannot be simply interpreted as an absence of consumption: it also reflects the relationship between refinery production, exports, imports, and domestic demand.
The US system is therefore showing two simultaneous signals. On the one hand, the country has a sufficiently broad crude base to register a weekly increase in stocks; on the other hand, inventories of strategic products for transport and industry continue to deteriorate against their historical benchmarks.
The EIA also placed commercial crude stocks 2% above the five-year average, while distillates remain well below that benchmark.
SOURCE and PHOTO: https://oilprice.com/
