The Oil Crisis Has Reached Costco’s Motor Oil Aisle

The oil crisis has spilled over to Costco's motor oil aisle. The once affordable prices have dramatically increased. Costco has doubled the price of its full-synthetic motor oil and implemented purchase rationing. A 10-quart case that used to cost around $30 is now priced at $57.99, with a limit of two units per member per week.

U.S. diesel prices have hit $6 a gallon for the first time this week. Global oil inventories have declined by more than 500 million barrels since the U.S.-Iran conflict began. This situation is impacting the entire oil industry. Base oil, which is used to produce motor oil, often comes from the same barrel as gasoline and diesel.

Refiners earn more by refining crude into fuel than into lubricants, so lubricant stock gets squeezed first. For Costco, the issue is more pressing as its signature Kirkland oil carries GM's Dexos1 Gen 3 certification. This certification requires manufacturers to pay GM separately for each product and unit sold. As a result, changing your oil with the Costco product now costs about as much as an independent shop would charge, undermining the DIY savings case.

This is not just affecting Costco. Mobil 1 is also limited, with five units capped at six quarts, running at $44. The International Energy Agency has cut its 2026 global oil supply forecast to 102 million barrels a day, projecting a third-quarter deficit of 1.8 million barrels a day. Advanced oil chemistries that meet the demands of advanced engines while also reducing environmental impact have contributed to the higher standards.