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AMSOIL Freedom Series 5W-40 100% Synthetic Diesel Oil packaging. Shop at AMSOIL, opens in a new tab

Official AMSOIL product photo. Packaging may vary.

Diesel oil / FD540QT-EA

AMSOIL Freedom Series 5W-40 100% Synthetic Diesel Oil

Freedom Series 5W-40 synthetic diesel oil, developed with Fleece Performance for diesel pickups, with turbo cleanliness and soot control.

U.S. product code
FD540QT-EA
Brand
AMSOIL
Dealer
Jeff Pittman · #30734402
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Find this product in the Canadian storefront; Canadian availability and package codes may differ. Prices, currency, shipping, and available packages are shown by the country storefront.

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About Freedom Series 5W-40 Diesel Oil

Freedom Series 5W-40 came from AMSOIL’s partnership with Fleece Performance Engineering and is aimed at diesel pickups, including those running Fleece performance parts.

Before you choose

Confirm the permitted 5W-40 viscosity, the required diesel-oil category, and any OEM specification for your engine and emissions equipment.

Is Freedom Series only for trucks with Fleece parts?

AMSOIL describes it as developed for trucks with Fleece Performance products; compare its current specifications with your engine’s requirements. Ask Jeff for help gathering the right product information.

Product information reviewed September 23, 2026. Read AMSOIL’s current details.

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