Key Highlights

  • US heating oil futures rose above $4.00 per gallon, their highest in two months, as Middle East tensions deepen concerns over refined fuel supply.
  • The diesel crack spread climbed above $91 per barrel, a record high, as refining capacity tightens globally.
  • Ukrainian strikes on Russia's largest refineries continue to curb diesel exports, compounding supply pressure.
  • Distillate inventories rose 4.6 million barrels for the week ended July 10, yet remain well below their five-year seasonal average.

If gasoline's crack spread at $59 per barrel looked stretched, diesel's is in genuinely uncharted territory. US heating oil futures — which trade as a proxy for diesel markets — climbed above $4.00 per gallon, their highest level in two months, and the diesel crack spread reached roughly $91 per barrel, a record high that underscores just how constrained global distillate supply has become.

The immediate catalysts mirror what's driving gasoline higher: the collapse of the US-Iran truce and renewed tanker attacks in the Strait of Hormuz have raised fears about fuel shipments from the Persian Gulf, a region that supplies a meaningful share of global refined product exports. But diesel markets are facing an additional, distinct pressure that gasoline isn't: continued Ukrainian strikes on Russia's largest refineries, which have persistently curbed Russian diesel exports at a time when global buyers have limited alternative sources to turn to.

The supply squeeze isn't purely geopolitical, either. Seasonal refinery maintenance — a routine annual occurrence where refiners take units offline for upkeep — has coincided with years of accumulated refinery closures across the US and Europe, meaning the industry has structurally less capacity available to absorb any disruption than it did five or ten years ago. That combination of routine seasonal downtime and reduced permanent capacity is a slow-moving structural tightening that geopolitical shocks are now landing on top of.

The inventory picture adds useful nuance. EIA data showed distillate fuel inventories actually rose by 4.6 million barrels in the week ended July 10 — a meaningful weekly build. Yet despite that increase, stockpiles remain well below their five-year seasonal average, illustrating just how large the starting deficit was. A single strong week of inventory building isn't close to enough to meaningfully close a gap built up over a longer period of underinvestment and disrupted supply.

The record crack spread is the number that matters most for understanding where this market goes next. When refiners can earn $91 per barrel simply for converting crude into diesel, the economic incentive to maximize distillate production is about as strong as it gets — yet supply still isn't recovering quickly, which points to genuine capacity constraints rather than refiners simply choosing not to produce more.

For consumers and businesses reliant on diesel — trucking, shipping, agriculture, home heating oil in the colder months ahead — this combination of Middle East supply risk, Russian refinery disruption, and structurally reduced global refining capacity suggests diesel prices are likely to stay elevated even if any single one of these pressures eases, since the others would still be operating independently.

This analysis reflects general commentary on publicly reported market data and is not investment advice.