Why did the 3:2:1 crack spread widen to 54.48 this month?
The 3:2:1 crack spread is 54.48, up 8.94 over the past 30 days. That number is a refiner's rough margin: the value of two barrels of gasoline and one of diesel against the three barrels of crude it takes to make them. When it widens, the refiner is earning more on every barrel run. So the question a working operator is asking is a simple one. What moved, and who is holding the extra 8.94?
The crack spread widens when crude falls faster than the products made from it, so I started with crude. WTI is down 28.4% over 30 days. Its 30-day low was 68.58, which means it is trading within a whisker of the bottom of its own month. Brent tells the same story, down 26.3%. Crude has come down by better than a quarter in four weeks.
Then I looked at the products, because a wider crack needs them to fall slower than crude, and they did. ULSD diesel futures are down 15.4%. RBOB gasoline is down 11.4%. So crude fell 28.4% while gasoline fell 11.4%. Crude dropped roughly two and a half times as fast as the gasoline it feeds. That difference in how fast the two fell is what moved the crack spread. The refiner buys the input that got cheap fast and sells outputs that got cheap slow, and the difference is the 8.94.
The wire says why crude moved. OPEC and its allies are raising output again, 188,000 barrels per day in August by the Reuters and WSJ accounts, and traffic through Hormuz is recovering after a tense stretch. One headline out of Azerbaijan puts global oil prices at pre-war lows. More barrels coming to market and a calmer Gulf both push crude down, and that is the input side of the crack getting cheaper. The refinery strikes in the Russia and Belarus reporting cut the other way, since taking refining capacity offline tightens product supply and supports product prices, but those are Belarusian and Russian plants and they show up more in product strength abroad than in a US gasoline number. The net of it here is crude falling hard on supply and products holding firmer.
The obvious read is that refiners are having a good month, and the crack spread says they are. A move of 8.94 to 54.48 is a real widening in the margin a refiner earns for turning crude into fuel, and it is the honest kind, earned by running plants while the input cost fell out from under the output price. If you own crude-to-product conversion right now, this is the part of the chain that got wider.
The retail side moved the other way. The diesel retail-wholesale spread is 1.336, down 0.375 over 30 days. That spread is the retailer's margin between the rack and the pump, and it narrowed by better than a third of a dollar in the same month the refiner's crack widened by 8.94.
That fits what happens when product prices fall fast. U.S. diesel is 4.668, down 12.7%, and U.S. gasoline is 3.964, down 10.7%. Retail pump prices tend to lag the wholesale drop, but this month the retail-wholesale spread shrank anyway, which means street diesel prices came down faster than the retailer's buy cost fell. The marketer passed the crude decline through to the customer quicker than the marketer's own cost eased. That is good for the trucker filling up and lighter for the retailer selling the fill.
One more point keeps the picture honest. RBOB is sitting exactly at its own 30-day low, which is to say gasoline wholesale is at the floor of its month, not somewhere in the middle. So the products in the crack are not strong in absolute terms. They are only strong relative to a crude price that fell further and faster. The crack widened because the denominator collapsed, not because fuel prices rose.
Two things hold up in these numbers. The crack widened because OPEC+ barrels and a calmer Hormuz pulled crude down while gasoline held firmer, and the refiner is the link in the chain holding that 8.94. The diesel marketer is not holding it, because the retail-wholesale spread narrowed by 0.375 in the same window. For now the margin landed at the refinery gate, and the folks running crude through their units earned it. What the numbers won't tell me is how long the gap lasts. Product prices usually follow crude down with a lag, and if gasoline and diesel keep sliding toward the crude that already fell, the crack could give back some of the 8.94 as that lag closes.