ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has set a new online price of $57.99 for its Kirkland Signature full synthetic motor oil in a 10-quart case. This package includes two 5-quart bottles and covers several common viscosity grades. Currently, Costco restricts members to one purchase per transaction and a maximum of two units within seven days. These limitations are explicitly displayed on the retailer’s product pages for selected Kirkland Signature synthetic motor oils.
The new price of $57.99 marks a significant jump from the approximately $30 cost for the same quantity last year. At present, Costco lists its 5W-30, 5W-20, and 0W-20 full synthetic two-packs at $57.99 online. The retailer notes that warehouse prices may differ depending on location. Each package provides 10 quarts of motor oil, making this price increase notable for members who handle their own vehicle maintenance.
In addition, Costco has imposed purchase restrictions on several Mobil 1 full synthetic motor oil products. Listings show a limit of five units per membership on selected six-packs containing individual one-quart bottles. These products include various viscosity options and high-mileage formulations. The restrictions extend beyond Costco’s Kirkland Signature line and encompass another widely available synthetic motor oil brand sold at the warehouse.
Limits on purchases span multiple synthetic motor oil products
Synthetic motor oils combine highly refined base oils with additives that safeguard engines and manage deposits, wear, and heat-related breakdowns. Group III base oils are an important component of many synthetic lubricants’ supply chains. The United States sources a large portion of these materials from producers across the Persian Gulf. Recent disruptions affecting energy production and shipping in the Middle East have limited the availability of some petroleum products and refining inputs.
Meanwhile, crude oil prices remain elevated as of mid-September. On September 16, Brent crude traded near $107.82 per barrel, while West Texas Intermediate hovered close to $104.86. Both benchmarks stayed above $100 after weeks of disturbances disrupting key Middle East energy routes. Shipping through the Strait of Hormuz has also decreased sharply from usual levels, and disruptions have affected Saudi Arabia’s Red Sea export infrastructure along with other regional energy facilities.
Rising crude oil costs exert pressure on petroleum markets
Among the Kirkland Signature products affected by the new limits are popular grades used in many passenger vehicles. Costco emphasizes that its synthetic motor oils deliver wear protection and help prevent thermal breakdown. Some 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 clearly shown on several product pages.
Costco has not publicly issued a detailed reason for the recent hike in motor oil prices and the introduction of purchase caps. However, its online listings now explicitly display both the $57.99 Kirkland price and the two-unit limit per week. Meanwhile, separate Mobil 1 listings continue to specify a limit of five units per membership. These changes occur amid rising petroleum prices and tightening lubricant supplies, situating Costco’s pricing policies and purchase restrictions within a broader context of strained energy markets.