JEFF PITTMAN / UNITED STATES & CANADAFind your oilTrack your orderAMSOIL Dealer #30734402
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AMSOIL 10W-40 100% Synthetic Dirt Bike Oil packaging. Shop at AMSOIL, opens in a new tab

Official AMSOIL product photo. Packaging may vary.

Motorcycle oil / DB40QT-EA

AMSOIL 10W-40 100% Synthetic Dirt Bike Oil

10W-40 synthetic dirt bike oil formulated for consistent clutch feel, gear protection, and heat resistance.

U.S. product code
DB40QT-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 10W-40 Dirt Bike Oil

AMSOIL 10W-40 Dirt Bike Oil is built for off-road motorcycles, where clutch engagement and heat are constant demands. Choose the viscosity your bike’s manufacturer specifies.

Before you choose

Confirm 10W-40 and the JASO wet-clutch requirement in your owner’s manual. Dirt bikes with separate engine and transmission sumps may need different fluids in each.

Does my dirt bike need a separate transmission oil?

Some bikes share one sump; others use separate engine and transmission oils. Check your manual before choosing. Ask Jeff for help gathering the right product information.

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

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