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 to The 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 to The 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.
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