ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has raised the online price of its Kirkland Signature full synthetic motor oil to $57.99 for a 10-quart case. This package, which includes two 5-quart bottles, is offered in various common viscosity grades. Additionally, Costco has implemented a purchase restriction on certain Kirkland motor oil items, allowing members to buy no more than two units in a single transaction within any seven-day span.
The new $57.99 price tag nearly doubles the approximate $30 price reported for the same quantity last year. On its website, Costco lists 5W-30, 5W-20, and 0W-20 Kirkland full synthetic oils at this price. The retailer notes that prices may vary between different warehouses and what is listed online. Each case contains 10 quarts, making this price increase particularly relevant for consumers who perform their own oil changes regularly.
These purchase limits extend beyond Costco’s private-label offerings. Certain Mobil 1 full synthetic motor oils now also have a cap of five units per membership. Mobil 1, an ExxonMobil brand, is available in several formulations, including standard and high-mileage types. The affected Costco listings include six-packs of one-quart bottles across multiple viscosity grades, broadening the restrictions to another significant synthetic oil brand.
Restrictions on Major Synthetic Motor Oil Products at Costco
Synthetic motor oils are formulated using highly refined base oils combined with additives designed to safeguard engines under tough conditions. Group III base oils are vital to many synthetic lubricant formulations sold in the United States. American consumers depend heavily on imported supplies, including shipments from the Persian Gulf region. Recent disturbances in Middle East energy markets have limited access to some petroleum products and lubricant components.
Crude oil prices also stayed above $100 a barrel in mid-September, with Brent crude trading near $107.82 on September 16, and West Texas Intermediate close to $104.86. The energy sector continues to reflect disruptions impacting production, exports, and major shipping routes in the Middle East. Shipping traffic through the Strait of Hormuz remains below normal levels, and Saudi Arabia’s Red Sea energy infrastructure has experienced disruptions as well.
Rising Oil Prices and Limited Lubricant Supplies Drive Price and Purchase Restrictions
The impacted Kirkland products are suitable for a wide range of passenger cars, SUVs, and light trucks. Costco states that its synthetic oils provide protection against engine wear and thermal breakdown. Certain formulations meet API SP and ILSAC GF-6A standards for modern gasoline engines. The American Petroleum Institute manages API motor oil standards, while ILSAC specifications focus on fuel economy, engine cleanliness, and wear protection.
Costco has not publicly provided a detailed explanation for the increased price of Kirkland motor oil or the new purchase restrictions. Its online listings currently display the $57.99 price and a limit of two units within seven days for selected products. Meanwhile, separate Mobil 1 listings continue to show a five-unit membership limit across various formulations. These updates reflect a broader trend of elevated crude oil costs and tighter lubricant supply chains affecting pricing and purchasing policies across the industry.