Costco has begun limiting how much motor oil members can buy at a time. The move comes as a worldwide shortage of a key ingredient for synthetic lubricants drives costs upward. A 10-quart pack of the retailer’s Kirkland Signature full synthetic oil now sells for $57.99, compared with roughly $30 in earlier periods. The change affects a product many drivers use for routine vehicle maintenance.
Store-Level Limits Take Effect
Shoppers at Costco warehouses and on the company’s website now face a cap of two units every seven days. The restriction applies to the popular two-pack of 5-quart containers that together hold 10 quarts. The current online price stands at $57.99 for the 0W-20 and 5W-20 full synthetic versions. This limit marks an uncommon step for an item that typically has a long shelf life and can be stored without issue. The policy reflects tighter supplies reaching store shelves and distribution centers. Members planning multiple oil changes may need to adjust their purchasing schedule or visit more frequently within the allowed window.
Global Shortage of Premium Base Oil
The root cause traces to reduced output of Group III base oils, a highly refined petroleum product essential for full-synthetic motor oils. Production disruptions in the Middle East have removed a significant share of normal supply. Roughly 44 percent of typical U.S. demand for these base oils previously came from the Persian Gulf region. Damage and shutdowns linked to the conflict in Iran have affected facilities in Qatar, Bahrain, and the United Arab Emirates. One notable loss involved Shell’s Pearl gas-to-liquids plant in Qatar, which had supplied about 30,000 barrels per day. Industry analysts expect repairs to take at least a year. Andrew Lipow, president of Lipow Oil Associates, noted that the squeeze centers on premium base stocks used in synthetic and synthetic-blend oils. Packaging plants and retailers have begun to feel the effects as inventories tighten.
Wider Price Pressures Across Fuels and Lubricants
Motor oil is not the only product feeling the strain. Regular gasoline has reached $4.16 per gallon in recent government readings, while diesel prices have climbed above $6 per gallon in some reports. Crude oil has moved back above $100 a barrel, giving refiners added incentive to direct barrels toward higher-value fuels rather than lubricant feedstocks. Industry data show the producer price index for finished lubricants rose about 15.8 percent between March and August. A separate survey of motor oil products recorded a 24.2 percent retail price increase from February through August. Some service providers have reported passing along higher costs, with oil changes rising by $5 to $7 in certain cases.
Outlook for Consumers and the Market
The Independent Lubricant Manufacturers Association has warned that pressure on U.S. base-oil supplies could continue into 2027. New domestic capacity is not expected to come online until then. In the meantime, blenders are seeking alternative sources, including supplies from South Korea. Costco has not yet commented publicly on the duration of the purchase limits. Drivers who perform their own maintenance may want to monitor inventory levels and plan ahead for upcoming service intervals. The situation underscores how events far from U.S. shores can quickly reach everyday household expenses.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.