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As a Costco member, you get exclusive access to high quality products at the lowest possible prices.

Fill up regularly with high quality Kirkland Signature™ Unleaded, Premium Unleaded 97 or Premium Diesel fuels to experience the efficiency and performance benefits of powerful deep-cleaning fuel additives. Every grade of Kirkland Signature Fuel contains additives that keep your engine protected and running like new, while saving you money.

Four great ways that Kirkland Signature™ Fuel helps deliver optimal performance and efficiency:

Reduces Emissions

Removing deposits allows the engine's sophisticated emissions controls to work as designed, helping to reduce exhaust pollution caused by valve deposits and plugged fuel injectors.

Helps Restore Fuel Economy

Deposits on injectors can affect the fuel spray pattern and timing which prevents good combustion. Kirkland Signature Fuels fight existing injector deposits and prevents new deposits from forming.

Clean fuel injectors provide maximum fuel flow and a fine spray that helps create efficient fuel combustion. Regular use of Kirkland Signature fuel promotes consistently clean engines, helping to restore an engine's maximum fuel economy.

Fights Harmful Deposits

Use of Kirkland Signature Unleaded or Premium Unleaded 97 helps to remove existing deposits on petrol engine intake valves, and prevents new deposits from forming. This increases vehicle reliability, reduces maintenance, and helps create optimal engine performance.

Improves Performance

Cleaning additives restore power by removing deposits from fuel injection equipment and prevent future build-up that can cause power loss and affect driveability.

Diesel fuel injectors showing deposit build-up (left) and as new (right)

Click to view the "Quality in the Tank" Costco Connection Article.