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 includes two 5-quart bottles and comes in several popular viscosity grades. Additionally, Costco has implemented a purchase restriction on select Kirkland motor oil products, allowing members to buy no more than two units in a single transaction within any seven-day window.
The current price of $57.99 is nearly twice the approximate $30 cost reported for the same quantity last year. The retailer lists 5W-30, 5W-20, and 0W-20 Kirkland full synthetic oils at that online price. However, Costco notes that prices can vary across individual stores compared to those on its website. Each case contains 10 quarts, so this price hike is particularly relevant to drivers who perform routine oil changes themselves.
Restrictions extend beyond Costco’s private-label products. Selected Mobil 1 full synthetic motor oils now have purchase limits of five units per membership. Mobil 1, an ExxonMobil brand, offers various formulations, including standard and high-mileage options. The affected listings at Costco include six-packs of one-quart bottles across multiple viscosity grades, broadening the restrictions to another key synthetic motor oil brand.
Restrictions on Major Synthetic Oil Brands Expand
Synthetic motor oils rely on highly refined base oils combined with additives designed to protect engines under tough operating conditions. Group III base oils are significant in many synthetic lubricants sold in the United States. American consumers depend heavily on imports, including shipments from the Persian Gulf region. Recent disruptions in Middle East energy markets have reduced the availability of some petroleum products and lubricant inputs.
Crude oil prices stayed above $100 a barrel in mid-September. On September 16, Brent crude traded near $107.82, while West Texas Intermediate was close to $104.86. Market movements continue to reflect issues impacting production, exports, and key shipping routes in the Middle East. Shipping through the Strait of Hormuz has remained below normal levels, with disruptions also impacting Saudi Arabia’s Red Sea energy infrastructure.
Rising Oil Prices Coupled with Limited Lubricant Supplies
The affected Kirkland products serve a wide range of passenger vehicles, SUVs, and light trucks. Costco emphasizes that its synthetic oils help prevent engine wear and thermal breakdown. Some formulations meet API SP and ILSAC GF-6A performance standards designed for modern gasoline engines. The American Petroleum Institute oversees API motor oil standards, while ILSAC specifications cover aspects like fuel economy, engine cleanliness, and wear protection.
Costco has not provided an extensive public explanation for the increased prices on Kirkland motor oil or the new purchase restrictions. Its online listings currently display the $57.99 price and the two-unit, seven-day purchase limit on selected products. Meanwhile, Mobil 1 listings continue to show a five-unit limit per membership on several formulations. These adjustments reflect a period of rising crude oil costs and tighter lubricant supply conditions, affecting pricing and purchasing policies across the industry.