Costco Doubles Motor Oil Prices and Caps Sales Amid Global Supply Crunch

Key points

• Costco increased the price of 10 quarts of Kirkland Signature full-synthetic motor oil to $57.99, up from approximately $30.
• The retailer implemented a purchase limit of two units per customer per week for its house brand and five units for Mobil 1.
• Crude oil is trading near $100 per barrel, while diesel prices have exceeded $6 per gallon for the first time in history.
• Refineries are prioritizing the production of gasoline and diesel over motor oil due to higher profit margins.
• Geopolitical tensions, including conflicts involving Iran, Israel, and Yemen, are disrupting key shipping routes like the Strait of Hormuz and Bab el-Mandeb.

Background

This development follows a series of oil price spikes earlier in 2026. In September, Brent crude surpassed $100 per barrel due to Middle East hostilities, and earlier that month, attacks on Saudi energy facilities caused temporary supply disruptions. These events have sustained volatility in global energy markets, creating a backdrop of tight supply for all petroleum-derived products.

How outlets are covering it

Jalopnik and The Drive both confirm the price hike and purchase limits at Costco, attributing the changes to a global shortage. The Drive provides additional detail on the economic drivers, noting that refineries earn more by producing fuel than motor oil. It also highlights how sophisticated oil chemistries and licensing fees, such as General Motors' Dexos program, increase costs. Jalopnik emphasizes the geopolitical factors, citing satellite imagery of smoke near Saudi Arabia's East-West Pipeline and Houthi activity in the Bab el-Mandeb Strait as key contributors to supply fears. Both outlets agree that the situation is severe, with The Drive noting that even Costco's discounted prices are no longer as favorable as they were weeks ago.

Why it matters

The rationing and price doubling of a staple automotive product at a major retailer signal a deepening global supply chain crisis. As refineries shift output toward higher-margin fuels, consumers face reduced availability and increased costs for essential maintenance items. This trend, combined with geopolitical instability, suggests that inflationary pressures on energy-related goods may persist through the fall and into the winter months.

What to watch

Analysts and officials, including President Trump, have indicated that gas and oil prices may not decline until after the November midterm elections. If disruptions to the Strait of Hormuz or Bab el-Mandeb continue, further price increases and rationing of petroleum products are likely. Consumers should expect continued volatility in fuel and lubricant markets as global supply remains tight.