AMSOIL Full Synthetic 10W-40 Motor Oil

AMSOIL 10W-40 synthetic oil is formulated with advanced technology to create the finest motor oils for people who demand maximum preservation and performance for their engines. The result is engine protection that surpasses even the most stringent industry benchmarks. Choose from the formulations below for oil that best meets your needs.

  • AMSOIL Extended-Life 10W-40 100% Synthetic Motor Oil

    • 37% more cleaning power1 to help keep your engine running smoother, longer.
    • Protects against LSPI
    • 20,000 miles of guaranteed protection between changes2

    1Compared to AMSOIL OE Synthetic Motor Oil.
    2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

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  • AMSOIL Z-RODĀ® 10W-40 100% Synthetic Motor Oil

    • Engineered for classic vehicles
    • Helps retain horsepower
    • High-zinc formula protects flat-tappet cams, lifters, rockers & other critical components
    • Protects against rust during storage
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  • AMSOIL DOMINATORĀ® 10W-40 100% Synthetic Racing Oil

    • Formulated specifically for racing & high-performance engines
    • Robust formulation resists viscosity loss
    • Proprietary friction modifier maximizes horsepower & torque
    • Fortified with anti-wear additives for extra protection
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  • AMSOIL Premium Protection 10W-40 100% Synthetic Motor Oil

    • High-zinc formula guards against wear
    • Ideal for flat-tappet cams
    • Resists deposits to help keep engines clean
    • Convenience of use for gas and diesel engines
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  • AMSOIL 10W-40 100% Synthetic Metric Motorcycle Oil

    • Premium wear protection
    • Smooth, confident shifts
    • Cool, clean performance
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  • AMSOIL 10W-40 100% Synthetic Dirt Bike Oil

    Designed to improve the performance of bike and rider.

    • Consistent clutch feel
    • Protects gears
    • Resists heat
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  • AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil

    • Protection when performing demanding chores and tackling tough terrain
    • Delivers consistent clutch feel
    • Superior all-weather performance
    • Wet-clutch compatible
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  • AMSOIL 10W-40 100% Synthetic Marine Engine Oil

    • Excellent high-stress, high-rpm endurance
    • Increased rust and corrosion protection
    • NMMA FC-W Catalyst Compatible
    • Perfect for hardcore anglers and boaters who demand the best protection for their marine engines
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  • AMSOIL Formula 4-StrokeĀ® 100% Synthetic Scooter Oil

    Outstanding Protection for Scooter Engines, Transmissions and Gearboxes

    • Wet-clutch compatible
    • Resists heat
    • Protects against wear
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  • AMSOIL 10W-40 100% Synthetic Small-Engine Oil

    • Protects up to 200 hours
    • Helps extend engine life
    • Rust-inhibited
    • Maximizes engine power
    • Helps cut maintenance costs
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