For a warehouse retailer famous for selling items in endless bulk, imposing strict purchasing limits is a massive red flag. But if you plan on doing a driveway oil change this weekend, you are in for severe sticker shock.
As The Drive originally reported, Costco has officially started rationing its motor oil to combat a rapidly deteriorating global lubricant shortage.
The days of grabbing cheap bulk oil are over. A 10-quart box of Kirkland Signature full-synthetic motor oil, which historically retailed for a bargain-basement $30, has skyrocketed to $58. More concerningly, Costco has implemented a strict two-box-per-customer weekly limit. Name brands aren’t faring much better; a six-quart case of Mobil 1 is currently sitting at $44, with purchases capped at five per member to prevent hoarders and scalpers from clearing the shelves.
While it’s easy to blame corporate greed for retail price hikes, this specific shortage is deeply rooted in international conflict.
Modern synthetic motor oil relies heavily on Group III base oils. Historically, the United States imports nearly 44% of its Group III supply directly from three major Persian Gulf producers: Bapco in Bahrain, ADNOC in the United Arab Emirates, and Pearl GTL in Qatar.
The ongoing military entanglement with Iran and the blockade of the Strait of Hormuz have effectively choked off these crucial exports. To compound the supply chain disaster, the massive Pearl GTL facility in Qatar sustained heavy damage from Iranian airstrikes in March 2026, instantly crippling a major portion of global production for at least a year.
Refineries Chase 40-Year Profit Highs
Typically, when Middle Eastern supply lines fracture, South Korean refiners step in to pick up the slack. Unfortunately, those refiners are currently struggling to secure raw crude oil themselves.
Furthermore, the petroleum industry is aggressively shifting its manufacturing priorities. Right now, global profit margins for diesel and jet fuel have hit staggering 40-year highs. Motor oil, diesel, and aviation fuel all originate from the same barrels of raw crude. Given the choice between producing essential base oils for passenger cars or cashing in on incredibly lucrative aviation and commercial diesel markets, refiners are overwhelmingly choosing the latter.
This geopolitical squeeze is hitting at the exact worst time for everyday drivers. Today’s highly stressed, turbocharged, small-displacement engines require incredibly sophisticated oil chemistries to prevent catastrophic failure and comply with strict environmental standards.
Because modern engines are so sensitive, automakers demand rigorous chemical testing and licensing. General Motors, for example, requires vendors to pay double licensing fees (both per product and per unit sold) just to print the “Dexos-approved” badge on their packaging. This certification appears directly on Costco’s Kirkland brand.
Combine a fractured Middle Eastern supply chain, international refiners chasing diesel profits, and the expensive licensing fees required for modern engines, and you have the perfect storm for empty shelves.