ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has increased the online price of its Kirkland Signature full synthetic motor oil to $57.99 for a 10-quart package. The product includes two 5-quart bottles and is available in multiple common viscosity grades. The retailer now enforces a limit of one transaction per member and a maximum of two units within a seven-day period. These restrictions are clearly displayed on the company’s product pages for selected Kirkland Signature synthetic motor oils.
The new $57.99 price mark represents a significant jump from the approximately $30 cost for the same quantity last year. Currently, Costco lists its 5W-30, 5W-20, and 0W-20 full synthetic two-packs at the same $57.99 online. The company notes that prices at warehouse locations may vary. Each package provides a total of 10 quarts of motor oil, making this price increase notable for members who handle their own vehicle maintenance.
In addition to Kirkland Signature products, Costco has set purchase limits on several Mobil 1 full synthetic motor oil items. The current online listings restrict customers to five units per membership for certain six-packs that include one-quart bottles. These products encompass a range of viscosity options and high-mileage formulas. The restrictions expand beyond Kirkland Signature, affecting another popular synthetic motor oil brand sold through Costco.
Restrictions Cover a Range of Synthetic Motor Oil Offerings
Synthetic motor oils rely on highly refined base oils combined with additives designed to protect engines, prevent deposit formation, reduce wear, and withstand thermal stress. Group III base oils are a significant component in many synthetic lubricants’ supply chains. The United States imports a considerable share of these materials from producers around the Persian Gulf. Recent disruptions in energy production and shipping within the Middle East have led to tighter supplies of certain petroleum products and refining components.
Crude oil prices also remain high as of mid-September. On September 16, Brent crude traded close to $107.82 a barrel, while West Texas Intermediate hovered near $104.86. Both benchmarks stayed above the $100 level after weeks of disturbances affecting major energy routes in the Middle East. Shipping through the Strait of Hormuz has decreased sharply from typical levels, and disruptions have impacted Saudi Arabia’s Red Sea export infrastructure as well as other regional energy operations.
Rising Crude Oil Prices Increase Market Tensions
The Kirkland Signature products subject to purchase limits include popular grades used in a wide variety of passenger vehicles. Costco states that its synthetic motor oils offer engine wear protection and help prevent thermal breakdown. Certain Kirkland formulations also meet API SP and ILSAC GF-6A performance standards. The Mobil 1 products listed by Costco include standard, fuel-efficient, and high-mileage options, with purchase limits clearly shown on several product pages.
Costco has not publicly explained the reasons behind the price hike for motor oils or the imposed purchase caps. However, its online listings now explicitly show the $57.99 price for Kirkland Signature oil and the two-unit per week purchase restriction. Meanwhile, Mobil 1 listings continue to specify a limit of five units per membership. These changes arrive amid rising petroleum costs and limited lubricant supplies, reflecting broader energy-market constraints impacting pricing and purchasing policies at Costco.