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 is available in various common viscosity grades. Additionally, Costco has implemented a purchase restriction on certain Kirkland motor oil items. Members are limited to buying no more than two units per transaction within any seven-day period.
The current price of $57.99 is almost double the roughly $30 that was reported for the same quantity last year. Costco lists 5W-30, 5W-20, and 0W-20 Kirkland full synthetic oil at that online price. The retailer notes that prices at individual warehouses may differ from those on its website. Each case contains 10 quarts, which makes this increase relevant for drivers who do their own routine oil changes.
The purchase limits extend beyond Costco’s private-label products. Selected Mobil 1 full synthetic motor oils now have a cap of five units per membership. Mobil 1 is an ExxonMobil brand available in several formulations, including standard and high-mileage versions. Listings affected include six-packs of one-quart bottles across multiple viscosity grades, broadening restrictions to another major synthetic motor oil brand.
Restrictions on key synthetic oil products expand at Costco
Synthetic motor oil relies on highly refined base oils blended with additives that protect engines under tough conditions. Group III base oils are significant in many formulations sold in the United States. American consumers depend heavily on imported supplies, including shipments from the Persian Gulf region. Recent disruptions in Middle East energy markets have reduced the availability of certain petroleum products and lubricant components.
Meanwhile, crude oil prices stayed above $100 a barrel in mid-September. On September 16, Brent crude traded near $107.82, and West Texas Intermediate was close to $104.86. Energy markets continue to reflect supply disruptions affecting production, exports, and major shipping routes in the Middle East. Traffic through the Strait of Hormuz remains below normal levels, with disruptions also impacting Saudi Arabia’s Red Sea energy infrastructure.
Rising oil prices lead to tighter lubricant supplies
The Kirkland products affected serve many cars, SUVs, and light trucks. Costco states its synthetic oils help prevent engine wear and thermal damage. Some formulations meet API SP and ILSAC GF-6A standards for modern gasoline engines. The American Petroleum Institute manages API motor oil standards. ILSAC standards focus on fuel economy, engine cleanliness, and wear protection.
Costco has not provided a detailed public explanation for the increased Kirkland motor oil price or the new purchase limits. Its online listings show the $57.99 price and the two-unit weekly limit for selected products. Meanwhile, Mobil 1 listings still display a five-unit limit per membership across several formulations. These changes reflect a period of higher crude prices and limited lubricant supplies, impacting Costco’s pricing and purchasing policies.