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Trump’s Iran War Crisis Sparks Rationing at Costco

Yahoo • September 14, 2026 • business

Key Points:

Costco is rationing its Kirkland Signature 5W-30 full synthetic motor oil, limiting members to two two-packs every seven days amid supply concerns linked to the Iran war.
The price for ten quarts of this motor oil has nearly doubled, rising from about $30 to $58, reflecting broader inflation in petroleum-based products.
Disruptions caused by the closure of the Strait of Hormuz have increased crude oil costs, with Brown University estimating over $100 billion in added gasoline and diesel expenses for the U.S. since February.
Gasoline and diesel prices have surged, with averages at $4.31 and $6.23 per gallon respectively, intensifying financial strain on American consumers.
The rationing at Costco may indicate more severe upstream supply chain issues, although public opinion largely opposes bearing high costs for the Iran conflict, with 69% viewing it as not worth the expense.

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