Scrolled to top

Kirkland Signature™ Diesel

Available at select Costco locations, Kirkland Signature™ Diesel helps deliver optimal engine performance and efficiency.

Tested in the lab to ensure quality and guaranteed to perform, our diesel fuel is formulated with powerful deposit control additives that deep clean your engine and protect critical fuel system components to prevent harmful wear, and keep your engine running like new.

Top Tier Diesel Fuel
Improves performance

Deposit control additives help restore lost power and performance by cleaning deposits from injectors and filters. Regular use prevents future deposit buildup that can cause power loss, poor idle and hesitation.

Enhances cold engine startability

All our diesel contains additives that help improve combustion for easy start-up and smooth operation.

Helps restore fuel economy

Clean fuel injectors provide precise fuel flow and an optimal spray pattern that creates efficient fuel combustion. Regular use of Kirkland Signature™ Diesel helps restore lost fuel economy.

Reduces emissions

Deposit removal allows the engine's sophisticated emissions control systems to work as designed, helping to reduce emissions caused by engine deposits.

Protects fuel injectors from deposits

Deposit control additives clean up existing deposits and keep new ones from forming. This helps increase vehicle reliability, reduces costly maintenance, and helps restore new engine performance.

Prevents harmful wear

All of our diesel contains additives that help protect critical fuel system components from friction and wear.

Deposit build up in tiny nozzle holes can impact performance by reducing fuel flow. Injector nozzle holes smaller than the diameter of a human hair. Diesel fuel injectors showing deposit build-up (left) and as new (right). Deposits on injectors can affect the fuel spray pattern and timing which prevents good combustion. Kirkland Signature™ Diesel fights existing injector deposits and prevents new deposits from forming.

Diesel Locations

Kirkland Signature™ Diesel is available at the following Costco locations:

Email your questions about diesel to: