Sure, it’s a great deal, but is it actually good for your car?
This Is the Brand of Gasoline Costco Sells
Published on May 22, 2025
Costco has a reputation for selling large quantities of things, from baked goods to paper products to produce. It’s not just the fact that everything Costco sells comes in large packages, but the store also just sells a lot of each item, which makes sense when you consider how much better Costco’s prices are than traditional retailers’. And since Costco’s gas prices are as good as the rest of its prices, it should come as no surprise that Costco also sells a lot of gas. In fact, in 2024 alone, Costco sold a whopping $30 billion worth of gas!
Sure, Costco’s gas may be cheap, and it may be popular, but is it good quality? Keep reading to find out what brand of gas Costco sells and whether or not you can trust its quality.
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What brand of gas does Costco sell?
Loyal Costco shoppers won’t be surprised to learn that the brand of gas sold by Costco is none other than Kirkland Signature Gasoline! Just like all of Costco’s in-house products, the membership club’s gas bears the Kirkland moniker. Costco purchases its gas from the biggest refineries and distributors in each region, and Costco guarantees its Kirkland Signature gas the same way it does the goods on the store’s shelves.
What types of gas does Costco sell?
Costco gas stations, like most modern gas stations, sells a few different types of gas, including regular, premium and diesel. The octane in gasoline does differ from state to state, but Costco usually carries fuel that’s 87 octane for regular and 91 octane for premium.
All gasoline contains octane, the level of which informs how it burns in the engine of your car. Higher-octane fuel is usually better at preventing issues that can damage your engine over time. Every car’s user manual comes with a recommended octane rating, but the gas sold at Costco is safe to use in most, if not all, modern vehicles.
Is Costco gas high-quality?
Yes! Costco’s gas is high-quality, and it even meets Top Tier performance standards, meaning it’s a brand you can definitely trust. The retailer goes to great lengths to make sure it remains that way consistently too. Costco’s Kirkland Signature gas is formulated with deposit control additives that prevent deposits from building up and clean your engine components to keep everything running smoothly. If you’ve noticed your fuel economy has started to drop, it’s probably due to these types of deposits. But choosing Costco gas stations can actually help restore your car’s intended mileage.
Costco also keeps its stations well maintained, which makes a huge difference in the quality of the fuel. When a gas station is properly operated and maintained, the fuel gets filtered, so contaminants don’t end up in your gas tank. The last thing you want is sediment and water making their way into your car.
Costco employees who work at the store’s gas stations keep a close eye on the flow rate of the nozzles to make sure the fuel filters are always fresh. When the flow rate starts to fall, they change the filters ASAP. Plus, Costco uses electronic sensors to monitor underground storage tanks for water, and employees inspect the tanks weekly, taking samples to make sure there’s never any contamination.
So the next time you stop in for that $1.50 hot dog to quell your hunger, know that you can fill up your tank for less too.
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