ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has raised the online retail price of its Kirkland Signature full synthetic motor oil to $57.99 per 10-quart case. The package includes two 5-quart bottles and is offered in multiple common viscosity grades. Additionally, Costco has implemented a purchasing restriction for certain Kirkland motor oil items. Customers are limited to purchasing a maximum of two units per transaction within any seven-day window.
The current price of $57.99 is nearly double the approximate $30 that was reported for the same volume last year. On its website, Costco lists 5W-30, 5W-20, and 0W-20 Kirkland full synthetic oils at this price point. The company notes that prices can vary between individual warehouses compared to those listed online. Each case provides 10 quarts, making this price increase particularly significant for drivers who perform routine oil changes themselves.
The purchase restrictions are not limited to Costco’s private-label products. Some Mobil 1 full synthetic motor oils now have a cap of five units per membership. Mobil 1, a brand owned by ExxonMobil, is available in various formulations, including standard and high-mileage options. The affected listings at Costco include six-packs of one-quart bottles across multiple viscosity grades, extending the restrictions to another major synthetic motor oil brand.
Restrictions on Major Synthetic Oil Offerings at Costco
Synthetic motor oils rely on highly refined base oils combined with additives that safeguard engines under tough conditions. Group III base oils are critical components in many synthetic lubricant formulations sold in the United States. Consumers in America depend heavily on imports, including shipments from the Persian Gulf region. Recent disruptions in Middle East energy markets have reduced the availability of certain petroleum products and lubricant inputs.
Furthermore, crude oil prices remained above $100 per barrel in mid-September. On September 16, Brent crude was close to $107.82, while West Texas Intermediate hovered around $104.86. The energy markets continue to reflect interruptions affecting production, exports, and major shipping routes through the Middle East. Traffic through the Strait of Hormuz was below normal levels, with additional disruptions impacting Saudi Arabia’s Red Sea energy infrastructure.
Rising Oil Prices and Limited Lubricant Supplies Drive Price and Purchase Policy Changes
The products affected by these limits are used by many passenger vehicles, SUVs, and light trucks. Costco claims its synthetic oils provide protection against engine wear and thermal breakdown. Several formulations meet API SP and ILSAC GF-6A standards, which are designed for modern gasoline engines. The American Petroleum Institute manages API motor oil standards, while ILSAC specifications focus on fuel economy, engine cleanliness, and wear resistance.
Costco has not provided a detailed explanation for the price increase of Kirkland motor oil or the implementation of purchase limits. Currently, its online listings show the $57.99 price and a maximum of two units per week for certain products. Meanwhile, Mobil 1 listings continue to display a five-unit purchase limit per membership across various formulations. These changes reflect broader market conditions characterized by rising crude oil prices and tighter lubricant supplies, impacting Costco’s pricing and buying policies.