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 case. Each package features two 5-quart bottles across various common viscosity grades. Additionally, a purchase limit has been implemented on certain Kirkland motor oil items. According to Costco’s current online listings, members are restricted to buying a maximum of two units per transaction within a seven-day period.
The new $57.99 price nearly doubles the approximately $30 cost reported for the same quantity last year. Costco lists Kirkland 5W-30, 5W-20, and 0W-20 full synthetic oils at this elevated online rate. It’s important to note that prices at warehouse stores might differ from those displayed online. This change primarily impacts consumers purchasing larger quantities for routine vehicle maintenance, as each Kirkland package contains 10 quarts of synthetic motor oil.
Limits have also been applied to select Mobil 1 synthetic motor oil products. As an ExxonMobil brand, Mobil 1 appears in multiple Costco listings with a cap of five units per membership. These include six-packs of one-quart bottles in various viscosity grades. Some listings feature standard formulations, while others include high-mileage variants. Consequently, these restrictions affect both Costco’s private-label Kirkland motor oil and certain products from a leading national lubricant brand.
Restrictions on motor oil extend beyond Kirkland brand items
The production of synthetic motor oils depends on refined base oils and additives crafted to shield engines against heat and intense use. Group III base oils are a crucial component of many synthetic lubricants available in the United States. A significant portion of these supplies is imported from overseas producers, including facilities in the Persian Gulf. Recent disruptions in Middle East energy markets have led to reduced availability of certain petroleum products and have tightened the lubricant supply chain in some regions.
Crude oil prices stayed above $100 per barrel in mid-September. On September 16, Brent crude traded near $107.82, while West Texas Intermediate hovered around $104.86. Ongoing supply disruptions in the Middle East continue to impact production, exports, and shipping routes. Shipping through the Strait of Hormuz remains below normal levels. Additionally, interruptions have affected Saudi Arabia’s Red Sea energy infrastructure, intensifying pressure across petroleum markets and the broader network that supplies refined fuels and lubricants.
Rising crude oil prices coincide with tighter lubricant supplies
Many passenger cars, SUVs, and light trucks rely on the affected Kirkland motor oils. Costco states that its full synthetic oils are designed to protect engines from wear and thermal stress. Several products meet API SP and ILSAC GF-6A standards for modern gasoline engines. The American Petroleum Institute oversees the API motor oil standards, while ILSAC specifications address fuel efficiency, engine cleanliness, and wear protection. These standards are displayed on numerous Kirkland synthetic oil listings.
Costco has not provided a detailed public explanation for the recent price hike of Kirkland motor oils or the introduction of purchase limits. Presently, the website indicates a $57.99 price point with a two-unit restriction for selected Kirkland items, while separate Mobil 1 listings continue to feature a five-unit cap per membership for several formulations. These adjustments coincide with elevated crude oil prices and strained lubricant supplies, with Costco’s posted limits defining the maximum quantities members can purchase online for affected products.