ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has increased the online retail price of its Kirkland Signature full synthetic motor oil to $57.99 for a 10-quart package. This bundle includes two 5-quart bottles and is available in multiple common viscosity grades. The retailer has now imposed a limit of one transaction and a maximum of two units per seven days for members. These restrictions are clearly displayed on the product pages for select Kirkland Signature synthetic motor oils.
The new price of $57.99 marks a notable jump from approximately $30 for the same quantity last year. Currently, Costco lists its 5W-30, 5W-20, and 0W-20 full synthetic two-packs at this same online price. The company mentions that warehouse prices may vary depending on location. Each package provides 10 quarts of motor oil, making this price increase significant for members who handle their own vehicle maintenance.
In addition, Costco has set purchase limits on several Mobil 1 full synthetic motor oil products. The current listings show a restriction of five units per membership for specific six-packs containing one-quart bottles. These include various viscosity options and high-mileage formulations. The restrictions extend beyond Costco’s Kirkland Signature line to cover another popular synthetic motor oil brand available through the retailer.
Limits on purchases span across multiple synthetic motor oil options
Synthetic motor oils consist of highly refined base oils combined with additives designed to protect engines and mitigate deposits, wear, and thermal breakdown. Group III base oils are a crucial component in the production of many synthetic lubricants. The United States sources a significant portion of these materials from producers around the Persian Gulf. Recent disruptions in energy production and shipping in the Middle East have limited the availability of certain petroleum products and refining inputs.
Crude oil prices remain elevated as of mid-September. On September 16, Brent crude traded near $107.82 a barrel, while West Texas Intermediate hovered close to $104.86. Both benchmarks have stayed above $100 after ongoing disruptions in key Middle Eastern energy routes. Additionally, shipping through the Strait of Hormuz has sharply declined from typical levels, with interruptions affecting Saudi Arabia’s Red Sea export facilities and regional energy infrastructure.
Rising crude costs influence petroleum markets broadly
The affected Kirkland Signature products include popular grades used across a variety of passenger vehicles. Costco states its synthetic motor oils offer protection against wear and help prevent thermal breakdown. Many Kirkland formulations also meet API SP and ILSAC GF-6A performance standards. Mobil 1 products listed by Costco include standard, fuel-economy, and high-mileage options, with purchase restrictions visible on multiple product pages.
Costco has not publicly explained the reasons behind the price hike and purchase limits for motor oil. However, its online listings now clearly indicate both the $57.99 price for Kirkland Signature and the two-unit limit within seven days. Meanwhile, Mobil 1 listings still specify a five-unit membership restriction. These changes come amid rising petroleum costs and limited lubricant supplies, placing Costco’s pricing policies and purchase restrictions within a broader context of strained energy markets.