ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has increased the online cost of its Kirkland Signature full synthetic motor oil to $57.99 for a 10-quart case. This package includes two 5-quart bottles and is available in various common viscosity grades. The retailer now enforces a limit of one transaction and a maximum of two units per seven days for members. These restrictions are clearly visible on the product pages for select Kirkland Signature synthetic motor oils.
The new $57.99 price marks a significant jump from the approximate $30 that was reported for the same volume last year. Currently, Costco lists its 5W-30, 5W-20, and 0W-20 full synthetic two-packs at $57.99 online. The retailer notes that warehouse prices can differ depending on location. Each package contains 10 quarts of motor oil, making this price increase notable for members who handle their own vehicle maintenance.
In addition to Kirkland products, Costco has imposed purchase restrictions on several Mobil 1 full synthetic motor oils. Presently, Costco’s listings specify a limit of five units per membership on selected six-packs that contain one-quart bottles. These include various viscosity options and high-mileage formulations. The restrictions expand beyond Kirkland Signature products and affect another popular synthetic motor oil brand available through the warehouse retailer.
Limits on purchases cover multiple synthetic motor oil options
Synthetic motor oils comprise highly refined base oils combined with additives designed to protect engines, prevent deposits, reduce wear, and manage thermal breakdown. Group III base oils are a key part of many synthetic lubricants’ supply chains. The United States sources a significant portion of these materials from producers in the Persian Gulf region. Recent disruptions impacting energy production and shipping in the Middle East have limited the availability of some petroleum products and refining components.
Crude oil prices have remained elevated in mid-September. On September 16, Brent crude was traded near $107.82 per barrel, with West Texas Intermediate close by at approximately $104.86. Both benchmarks stayed above $100 amid ongoing disruptions affecting major Middle East energy routes. Shipping through the Strait of Hormuz has also decreased sharply from usual levels, with interruptions impacting Saudi Arabia’s Red Sea export infrastructure and regional energy operations.
Rising crude oil prices intensify pressure on petroleum markets
The Kirkland Signature products subject to purchase limits include well-known grades used in a wide variety of passenger vehicles. Costco states that its synthetic motor oils offer engine wear protection and assist in controlling thermal breakdown. Several Kirkland formulations also meet API SP and ILSAC GF-6A performance standards. The Mobil 1 offerings listed by Costco include standard, fuel-economy, and high-mileage formulas, with purchase restrictions shown on various product pages.
Costco has not publicly explained the reasons behind the price hike and purchase limits for motor oils. However, its online listings now clearly display both the $57.99 Kirkland price and the two-unit maximum per week. Meanwhile, individual Mobil 1 listings continue to show a five-unit limit per membership. These developments arrive amid higher petroleum prices and tighter lubricant supplies, situating Costco’s pricing and restrictions within a broader context of constrained energy markets.