ISSAQUAH, WASHINGTON / RankWire.AI / – Costco has increased the online retail cost of its Kirkland Signature full synthetic motor oil to $57.99 for a 10-quart case. Each package includes two 5-quart bottles across several common viscosity grades. Additionally, the retailer has implemented purchase restrictions on certain Kirkland motor oil items. Members are limited to buying a maximum of two units in a single transaction within a seven-day span, according to the current online listings from Costco.
The new price of $57.99 is almost double the approximately $30 price reported for the same quantity last year. Costco’s online listings show Kirkland 5W-30, 5W-20, and 0W-20 full synthetic oils at this increased rate. Prices at physical warehouse locations might differ from those displayed online. This change primarily impacts consumers who purchase larger quantities for routine vehicle maintenance, as each Kirkland package provides 10 quarts of synthetic motor oil.
Costco has also set purchase caps on select Mobil 1 synthetic motor oil products. As an ExxonMobil brand, Mobil 1 appears in several Costco listings with a limit of five units per membership. These restrictions apply to six-packs of one-quart bottles available in various viscosity grades. Some listings include standard formulations, while others feature high-mileage variants. Consequently, the limits cover both Costco’s private-label Kirkland motor oil and certain products from a well-known national lubricant brand.
Restrictions on motor oil extend beyond Kirkland brand products
Synthetic motor oils are produced using refined base oils combined with additives designed to safeguard engines against heat and heavy-duty operation. Group III base oils are a key component in many synthetic lubricants sold in the United States. A significant portion of these supplies are imported from overseas producers, including facilities in the Persian Gulf. Recent disruptions in Middle East energy markets have led to reduced availability of some petroleum products and have constrained segments of the lubricant supply chain.
Crude oil prices remained above $100 per barrel in mid-September. Brent crude traded close to $107.82 on September 16, while West Texas Intermediate hovered around $104.86. Ongoing disruptions in Middle East supply chains have affected production, exports, and shipping routes. Traffic through the Strait of Hormuz stayed below typical levels, and energy infrastructure in Saudi Arabia’s Red Sea region also experienced interruptions, intensifying pressure on petroleum markets and the broader supply network for refined products and lubricants.
Rising crude oil costs coincide with tightening lubricant supplies
The affected Kirkland motor oils are used by many passenger cars, SUVs, and light trucks. Costco states that its full synthetic oils are designed to protect engines from wear and thermal breakdown. Several products meet API SP and ILSAC GF-6A standards, which ensure performance for modern gasoline engines. The API (American Petroleum Institute) manages motor oil standards, while ILSAC covers aspects such as fuel economy, engine cleanliness, and wear protection. These certification marks are present on various Kirkland synthetic oil listings.
Costco has yet to provide a detailed explanation for the recent price hike of Kirkland motor oil or the new purchase limits. Currently, its website displays the $57.99 price and a restriction of two units per seven days on selected Kirkland products. Meanwhile, Mobil 1 listings continue to show a five-unit limit per membership for several formulations. These updates come amid elevated crude oil prices and constrained lubricant supplies, with Costco’s posted restrictions now dictating how much members can buy through affected online listings.
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