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Costco has raised the price of its Kirkland Signature full-synthetic motor oil and begun limiting how much any one member can purchase, as a global lubricant shortage tied to the ongoing Middle East conflict pushes crude oil toward $100 a barrel.
That 10-quart case — two 5-quart bottles, enough for a typical V6 or V8 oil change — has jumped to $57.99, compared with the roughly $30 price members had grown accustomed to paying, according toThe Drive.
Stores are capping purchases at two units per customer per week.
The retailer has also imposed a five-per-member limit on Mobil 1, with six quarts of that brand running $44.
The rationing reflects pressure from multiple directions.
The connection to fuel prices runs through the refinery: base oil shares its crude-oil origins with gasoline and diesel, so when margins on finished fuel are strong, refiners have a financial reason to favor fuel production over lubricant stock, according toThe Auto Wire.
EIA data showed the gasoline crack spread sitting roughly a dollar per gallon higher than where it stood at the same point in 2025, a gap that has squeezed base oil availability and pushed its price upward.
Regulatory and licensing costs add a separate layer of expense.
The Kirkland 5W-30 displays the dexos1 Gen 3 certification, GM's proprietary specification, and earning that mark is not free — manufacturers must put their formulation through GM's independent testing protocol and obtain a license from the automaker, paying separately for each product and each unit sold, according to The Auto Wire.
Layered on top of that is an industry-wide burden: when the API SP category took effect around 2020, it introduced seven additional laboratory tests with no equivalent in the previous standard, among them a procedure targeting low-speed pre-ignition, the knock-like detonation problem associated with modern turbocharged, direct-injection engines.
The supply squeeze is unfolding against a backdrop ofa worsening global oil deficit.
The International Energy Agency cut its 2026 global oil supply forecast to 102 million barrels per day in August, projecting a deficit of 1.8 million barrels per day in the third quarter — more than double its prior estimate.
| Product | Price | Change |
|---|---|---|
| Brent Crude | $102.14/bbl | +0.34% |
| WTI Crude | $96.90/bbl | +0.21% |
| EN590 Diesel | $846/MT | +0.18% |
| Jet Fuel A-1 | $1090/MT | +0.55% |
| Mazut M100 | $450/MT | -0.15% |
| Bitumen 60/70 | $470/MT | +0.08% |
| Sulphur Gran 99.5% | $470/MT | -0.44% |
| Urea 46% Gran | $650/MT | +1.12% |
| NPK 16-16-16 | $460/MT | -0.28% |
| Nat Gas TTF | $15.42/MMBtu | +0.92% |
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