Costco members who rely on Kirkland Signature synthetic motor oil for do-it-yourself car maintenance are facing new challenges. The price of a 10-quart case of Kirkland full-synthetic oil has risen sharply to $57.99, up from the mid-$30 range where it had remained for years. Alongside the price increase, Costco has introduced purchase limits, restricting members to two cases every seven days, or a maximum of 20 quarts within that period.
Motor oil rationing is uncommon, highlighting the severity of the current supply situation. The tightening supply of lubricants is driven by the complex demands of modern engines and stricter industry standards. Today's motor oils must meet rigorous specifications, such as General Motors' dexos1 Gen 3 approval, which requires extensive testing for performance and protection, including against low-speed pre-ignition in turbocharged direct-injection engines.
These advanced formulations increase production costs before the oil even reaches retailers. Additionally, the base oils used in lubricants come from the same refining processes as gasoline and diesel. When fuel markets are more profitable, refiners may reduce base oil output, further constraining supply and pushing prices higher.
Costco's purchase limits extend beyond Kirkland products; Mobil 1 motor oil is also rationed, though with a higher limit of five units per member. For consumers who perform their own oil changes, these changes mean higher expenses and reduced availability, diminishing the traditional savings of DIY maintenance.
The combination of price hikes and rationing at a major retailer like Costco underscores the current pressures on the lubricant market and signals potential ongoing challenges for vehicle owners and service providers.