Does Costco Sell Diesel Fuel? (Price, Quality + Locations)

Does Costco Sell Diesel Fuel

If you’re a loyal Costco member and you aren’t aware they have a gas station, don’t worry, only select Costco locations include their gas stations! However, for those of you who do live near a Costco gas station, you may have wondered if they sell diesel fuel there. 

Costco gas stations in select locations do sell diesel fuel! In fact, they sell their own Kirkland Signature diesel! 

In this article, we will discuss the benefits of getting fuel from Costco, an overview of their diesel fuel, and provide a rundown of the areas diesel fuel is available at Costco. 

Why Should I Get My Gas At Costco? 

There are many different reasons why getting gas from Costco is better than other gas stations. 

First, all gas from Costco gasoline is their Kirkland Signature brand. Their gas has been certified to meet TOP TIER™ performance standards and is formulated to clean your engine and reduce harmful buildup. Their fuel can help improve the performance of your car, restore fuel economy, and reduce emissions. 

Next, just like Costco is known for low prices in their warehouse, they also have low fuel prices. They have exclusive low prices that they offer to their members. You can even check the gas prices at your nearest Costco gas station using the Costco app. 

Costco gas stations are designed with one-way traffic to keep lanes moving swiftly. They have extra long fuel hoses so you can drive up to any pump with ease, no matter which side your tank is on. 

Costco also provides attendants at each station that are trained to help whenever an issue arises. 

Members of Costco will earn cash back on their Costco Anywhere Visa® Card by Citi as well! 

And finally, Costco has great diesel fuel at select locations! 

Read also >> Does BJ’s Sell Diesel Fuel? (Price, Quality + Locations)

What Is Special About Costco Diesel Fuel?

The Kirkland Signature Diesel fuel is also certified as a TOP TIER™ fuel and has been lab-tested to ensure its high quality. 

Some of the benefits of Kirkland Signature Diesel include: 

  • It improves the performance of your vehicle using deposit control additives. These additives will help restore lost power and performance by cleaning your injectors and filters. Using Kirkland diesel regularly will prevent future deposit buildup which causes power loss, poor idling, and hesitation. 
  • It enhances your engine’s ability to start from cold. Kirkland’s signature diesel includes certain additives that help improve combustion in your engine for easy start-up from a cold engine. 
  • It helps restore fuel economy due to its clean fuel injectors which help with consistent fuel flow levels and an optimized spray pattern. These work together to create efficient fuel combustion. 
  • It reduces the emissions of your vehicle. Since the diesel gas helps remove deposits it allows the engine’s emissions control systems to work more efficiently and reduce the emissions they cause when they are not working as they were designed due to build up.
  • It protects fuel injectors from future deposit. This will help increase the reliability of your vehicle, reduce the number of costly maintenance you need, and can help restore your engine performance to work as it did when it was new. 
  • It prevents harmful wear and tears on your engine. All of the additives in the diesel fuel work together to protect the critical fuel system components. 

Is Costco Diesel Really Cheaper?

Costco has some of the lowest gas prices around, and this includes their diesel prices. While it is hard to pinpoint exactly what their gas will cost, since the price will fluctuate depending on where you are located, you can assume it will be lower than their competitors. 

And don’t think that this is because Costco gas isn’t high quality, it is! Costco is able to keep their prices low thanks to their loyal members. 

In order to purchase gas from Costco, you must be a member, these membership costs help keep all of Costco’s prices low, including their gas!

If you are curious about comparing Costco’s fuel prices to surrounding stations you can download the GasBuddy app and check. 

Where Can I Find Costco Diesel Fuel?

Costco doesn’t sell their diesel fuel at all of their gas stations, it is only available in select locations in the following states: 

  • Alaska
  • Arizona
  • California
  • Colorado
  • Hawaii
  • Idaho
  • Illinois
  • Indiana
  • Kansas
  • Kentucky
  • Louisiana
  • Michigan
  • Missouri
  • Montana
  • Nevada
  • Nebraska
  • New Jersey
  • New York
  • North Dakota
  • Ohio
  • Oklahoma
  • Oregon
  • Texas
  • Utah
  • Virginia
  • Washington
  • Wisconsin

For specifics on the gas stations within each state, you can go to Costco’s website. Click on the state you want to know more about and you will see the locations that carry diesel fuel. 

What Is TOP TIER™ Fuel?

TOP TIER™ is a premier fuel performance designation that is developed and enforced by leading manufacturers of automotive and heavy-duty equipment.

It is a gas that is intended to keep your car engines cleaner and improve the performance of your vehicle. In order for a retailer, such as Costco, to become a retailer of TOP TIER™ fuel, they have to get licensed

All TOP TIER™ retailers are randomly audited to ensure that their fuel is continually meeting the required standards.

A TOP TIER™ certification is important because it shows that the retailer is supportive and wants to offer the highest standard of fuel available to their customers. Since auto companies are not the ones who have the power to set fuel standards, this is the best way for them to show that they are taking additional steps to provide the best fuel possible.


If you’re a Costco member who isn’t currently taking advantage of their cheap gas prices you should consider checking out how the prices compare to your normal station. And, if you’re someone on the fence about getting a membership, the savings on fuel might be what pushes you to make the jump! 

Costco gasoline, including their diesel gas, is some of the cheapest, highest quality fuel you can find out there today.



Jeff is an automotive technician, technical writer, and Managing Editor. He has held a lifelong passion for cars, with a particular interest in cars like the Buick Reatta. Jeff has been creating written and video content about transportation, automotive, electric cars, future vehicles as well as new, used for more than 18 years. Jeff is based in Boulder, Colorado.

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