ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has raised the online 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 available in several common viscosity grades. Additionally, Costco has implemented a purchase restriction for certain Kirkland motor oil items. Members are limited to buying no more than two units in a single transaction within any seven-day period.
The current $57.99 price marks nearly twice the approximate $30 level reported for the same quantity last year. According to Costco, 5W-30, 5W-20, and 0W-20 Kirkland full synthetic oils are offered at this online rate. The retailer notes that prices at individual warehouses might vary from those listed on its website. Each case contains 10 quarts, making the price increase particularly relevant to consumers who perform routine oil changes themselves.
These restrictions extend beyond Costco’s private-label products. Selected Mobil 1 full synthetic motor oils now carry purchase limits of five units per membership. Mobil 1 is an ExxonMobil brand available in various formulations, including standard and high-mileage options. The affected listings on Costco’s website include six-packs of one-quart bottles across multiple viscosity grades, expanding the scope of restrictions to another major synthetic motor oil brand.
Major synthetic oil products face Costco purchase caps
Synthetic motor oil relies on highly refined base oils combined with additives designed to protect engines under tough conditions. Group III base oils are vital components in many synthetic lubricants sold in the United States. American consumers depend heavily on imported supplies, including shipments produced in the Persian Gulf region. Recent disruptions in Middle East energy markets have limited availability for some petroleum products and lubricant inputs.
Crude oil prices stayed above $100 per barrel in mid-September. On September 16, Brent crude traded near $107.82, while West Texas Intermediate hovered around $104.86. Market conditions continue to reflect interruptions affecting production, exports, and key shipping routes in the Middle East. Shipping through the Strait of Hormuz remained below normal levels, and disruptions also impacted Saudi Arabia’s Red Sea energy infrastructure.
Rising crude prices coincide with tightening lubricant supplies
Many passenger cars, sport utility vehicles, and light trucks benefit from the Kirkland synthetic oils. Costco states that its synthetic formulations help prevent engine wear and thermal breakdown. Certain products meet API SP and ILSAC GF-6A performance standards, which are set for modern gasoline engines. The American Petroleum Institute oversees API motor oil standards, while ILSAC specifications focus on fuel economy, engine cleanliness, and wear protection.
Costco has not provided an extensive public explanation for the increased Kirkland motor oil price or the new purchase limits. Its online listings currently display the $57.99 price and a two-unit, seven-day restriction for some items. Meanwhile, separate Mobil 1 listings continue to show a limit of five units per membership for various formulations. These updates reflect a broader context of rising crude oil prices and tighter lubricant supply chains, impacting Costco’s pricing and purchasing policies.