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 case includes two 5-quart bottles available in several common viscosity grades. The retailer has also implemented a purchase restriction on certain Kirkland motor oil products. According to Costco’s current online listings, members are limited to buying no more than two units in a single transaction within a seven-day period.
The new price of $57.99 is nearly double the approximately $30 that was reported for the same quantity last year. Costco lists Kirkland 5W-30, 5W-20, and 0W-20 full synthetic oils at this higher online rate. Prices at warehouse stores may differ from those on the website. This change primarily impacts customers purchasing larger quantities for routine vehicle maintenance, as each Kirkland package contains 10 quarts of synthetic motor oil.
In addition, Costco has set limits on select Mobil 1 synthetic motor oil products. Mobil 1, a brand owned by ExxonMobil, appears in several Costco listings with a five-unit purchase cap per membership. These include six-packs of one-quart bottles across multiple viscosity grades. Some listings feature standard formulations, while others include high-mileage options. Therefore, restrictions apply not only to Costco’s private-label Kirkland motor oil but also to certain products from a major national lubricant brand.
Limits Extend Beyond Kirkland Synthetic Oils
Synthetic motor oil production depends on refined base oils and additives formulated to safeguard engines under high heat and heavy use. Group III base oils are a key component in many synthetic lubricants available in the United States. A significant portion of these supplies is imported from overseas producers, including facilities located in the Persian Gulf. Recent disruptions in Middle East energy markets have decreased the availability of some petroleum products and created shortages in parts of the lubricant supply chain.
Crude oil prices remained above $100 a barrel in mid-September. Brent crude traded near $107.82 on September 16, while West Texas Intermediate was close to $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 typical levels. Interruptions also affected Saudi Arabia’s Red Sea energy infrastructure, adding strain to petroleum markets and the wider network supplying refined products and lubricants.
Rising Crude Prices Amplify Lubricant Supply Challenges
Many passenger cars, sport utility vehicles, 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. Certain products meet API SP and ILSAC GF-6A performance standards for modern gasoline engines. Managed by the American Petroleum Institute, API standards address motor oil quality, while ILSAC specifications focus on fuel efficiency, engine cleanliness, and wear protection. Several Kirkland synthetic oil listings specify these standards.
Costco has not provided a detailed public explanation regarding the price hike of Kirkland motor oil or the new purchase limits. Its website currently displays the $57.99 price and a restriction of two units per seven-day period for selected products. Meanwhile, Mobil 1 listings continue to show a five-unit limit per membership on various formulations. These changes occur amidst elevated crude oil prices and tighter lubricant supplies, with Costco’s posted limits defining the maximum purchase quantities online for affected products.
}**rjv0akjbp2**