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. The package, which includes two 5-quart bottles, is available across multiple viscosity grades. Additionally, Costco has implemented a purchase limit for certain Kirkland motor oil items, restricting members to buy no more than two units per transaction within any seven-day window.
This $57.99 price nearly doubles the roughly $30 reported for the same quantity last year. The online listing includes 5W-30, 5W-20, and 0W-20 Kirkland full synthetic oils. Costco notes that prices may vary between individual stores and those shown online. Each case contains 10 quarts, making this price hike significant for consumers performing routine oil changes themselves.
The purchase restrictions extend beyond Costco’s store-brand products. Selected Mobil 1 full synthetic motor oils now have a cap of five units per membership. Mobil 1, an ExxonMobil brand, offers various formulations including standard and high-mileage options. Listings affected include six-packs of one-quart bottles across multiple viscosity grades, broadening restrictions to another key synthetic motor oil line.
Restrictions on Major Synthetic Oil Lines Impact Consumers
Synthetic motor oils rely on highly refined base oils combined with additives that safeguard engines under tough conditions. Group III base oils are essential in many formulations sold in the United States. The country depends heavily on imported supplies, including shipments from the Persian Gulf. Recent disruptions in Middle East energy markets have limited availability of some petroleum products and lubricant components.
Crude oil prices stayed above $100 per barrel in mid-September, with Brent crude trading around $107.82 on September 16 and West Texas Intermediate near $104.86. Ongoing energy market disruptions in the Middle East have affected production, exports, and key shipping routes, including traffic through the Strait of Hormuz and Saudi Arabia’s Red Sea energy infrastructure.
Rising Oil Prices and Supply Tightness Drive Cost Increases
The affected Kirkland motor oils cater to a range of passenger cars, SUVs, and light trucks. Costco states that its synthetic formulations help prevent engine wear and thermal damage. Many meet API SP and ILSAC GF-6A standards, which ensure compatibility with modern gasoline engines and focus on fuel efficiency, engine cleanliness, and wear protection, overseen respectively by the API and ILSAC.
Costco has not provided a detailed explanation for the price increase or the new purchase limits. Its website currently lists the $57.99 price and restricts selected products to two units per week. Meanwhile, Mobil 1 listings continue to show a five-unit cap per membership across several formulations. These changes reflect a broader trend of rising crude oil costs and tight lubricant supplies affecting retail pricing and purchasing policies nationwide.