Costco Rations Motor Oil as Iran War Squeezes Global Lubricant Supply

Costco is now rationing motor oil, a first for the warehouse giant, as the war with Iran and shipping disruptions through the Persian Gulf hammer the global lubricant supply chain. Members are limited to one transaction and a maximum of two units every seven days on Kirkland Signature house-brand full-synthetic oil.

What Costco changed

A 10-quart box of Kirkland Signature full-synthetic, which sold for as little as $30 before the current Middle East conflict, is now priced at $58 on the retailer’s own listings. Costco has also capped purchases of Mobil 1 full-synthetic at five units per member, according to the company’s website.

The retailer has not issued a formal public statement explaining the rationing beyond what is reflected in its own product listings, which display “Limit 2 Per Member” notices.

Why it is happening

Motor oil is refined from the same crude barrel that produces gasoline and diesel. With fuel refining margins at record highs, refiners have been prioritizing gasoline and diesel production over lubricant base stocks, squeezing supply of the feedstock used to make motor oil.

Two automakers have already warned of dwindling motor oil stock, raising concerns about availability for both consumer purchases and dealership service departments.

Do you want to see how to make more plays? Do you want to find gains yourself?

Unusual Whales helps you find market opportunities through our market tide, historical options flow, GEX, and much, much more.

Create a free account here to start conquering the market with Unusual Whales.

The bigger supply picture

Crude is trading around $100 per barrel, and the pressure is spreading across the barrel. Satellite imagery has shown smoke in the vicinity of Saudi Arabia’s East-West Pipeline, according to Reuters. It has become a vital means for the kingdom to divert its crude exports from Hormuz, and if it goes down, that spells trouble for everybody.

Yemen’s Iran-aligned Houthis have reached the island of Perim in the Bab el-Mandeb Strait. While it isn’t as well known as Hormuz, Bab el-Mandeb is another critical Middle Eastern shipping lane that, if disrupted, could send shockwaves to the global supply chain.

All of this has led to the price of diesel cracking $6 per gallon for the first time in history, with it sitting at $6.06, according to AAA.

Options market and stocks to watch

Watch for reaction across retail, refiners, and lubricant makers as the rationing story spreads.

• COST: Watch for headline-driven flow on Costco itself as it becomes the face of the shortage; foot traffic and member optics both matter here.
• XOM: Mobil 1 is an ExxonMobil brand and is also being capped; watch for downstream lubricant margin commentary.
• VLO: Refiners are prioritizing gasoline and diesel over base oils; watch crack spreads and refining margins.
• MPC: Same refining margin tailwind, with lubricant base stock exposure worth watching.
• USO: The crude proxy to watch alongside every Hormuz and Bab el-Mandeb headline.

What traders should track next

Watch for other big-box retailers to follow Costco with limits, further automaker warnings on service department oil supply, and any updates on the East-West Pipeline and Bab el-Mandeb. Any of those escalations feed straight back into crude, refiners, and consumer staples exposure. Check other news for updates as the story develops.

Want more market intelligence? Create your free Unusual Whales account for options flow, market tide, GEX, and the full toolkit.