Diesel crack hits $100 a barrel for first time as refining margins tighten
The diesel crack cleared $100 a barrel for the first time, according to RBN Energy, topping even the 2022 post-COVID run. For anyone buying wholesale product off the rack, that is the number that matters this week. When the crack is that wide, the spread between crude and finished diesel is doing the work, and rack diesel stays expensive no matter what crude does next.
The mechanics are simple enough. A crack spread is the margin a refiner earns turning a barrel of crude into product. Push it to $100 and the market is telling you diesel is scarce relative to the crude that makes it. Mansfield's market note pins the same thing from the inventory side: fuel stocks are tight, and prompt WTI recovered this morning after dropping more than $1.50 overnight. Crude can soften while diesel does not, and this week jobbers are paying for the diesel side, not the crude.
Allocation risk
Tight diesel plus a fat crack is the setup where suppliers start watching lifting patterns. Allocation hasn't been posted yet, but a $100 crack means branded and unbranded supply can diverge fast. Branded jobbers get their contracted gallons; unbranded buyers chasing the cheapest rack can find the terminal dry or the price moved against them by the time the truck loads. If you buy spot, watch your terminal's postings twice a day, not once.
Hormuz and crude flow
The Strait of Hormuz is still the swing factor on the crude side. Mansfield reports flows improving through the strait, which took the overnight bid out of WTI. Better crude movement could ease the front of the barrel, but it does nothing for the diesel crack directly. Crude relief and diesel relief are running on separate tracks right now, and the diesel side is the one hurting resellers.
Canadian crude
Roughly 4 million barrels a day of Canadian crude still flow south into US refineries, per Transport Topics, even as Trump posted "WE DON'T NEED CANADA" and kept a 50% tariff on Canadian aluminum. For fuel buyers the takeaway is narrower: that Canadian barrel feeds a lot of Midwest and Gulf refining runs, and anything that taxes or slows it lands on the same tight product market driving the crack now.
EIA also logged 8 liquids pipeline projects finished since the start of 2025, with 14 more announced. More takeaway capacity helps crude reach refineries, not diesel reach your rack.
What to watch
Whether the diesel crack holds above $100 or starts to ease as Hormuz flows steady. Whether any refiner or terminal posts allocation. And whether the Canadian tariff fight touches crude, not just metals.