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The Best Motor Oil for Racing Dirt Bikes

AMSOIL Synthetic Dirt Bike Oil Helps Improve Performance of Bike and Rider

AMSOIL Synthetic Dirt Bike Oil delivers consistent clutch feel and outstanding gear protection in four-stroke dirt bikes, providing riders the confidence they need to maximize their performance on the trail and at the track.

Consistent Clutch Feel

Clutch slippage or inconsistent clutch feel can prevent dirt bike riders from riding as fast or effectively as they like. To keep the engine within the power band, riders often modulate the clutch, increasing the opportunity for clutch slippage if low-quality lubricants are used.

AMSOIL Synthetic Dirt Bike Oil’s superior friction-durability properties help minimize clutch slippage, fade and chatter, giving riders consistent clutch feel during takeoffs or when maneuvering around obstacles on the trail. In an extreme simulated-start test, AMSOIL Synthetic Dirt Bike Oil continued to deliver consistent clutch feel following 32 simulated race starts, while a leading original equipment manufacturer (OEM)-branded oil demonstrated inconsistent clutch-lever action and poor clutch feel after 16 starts. The clutch plates lubricated with AMSOIL Synthetic Dirt Bike Oil remained clean and in good overall condition, while the plates using the OEM oil revealed discoloration and wear. AMSOIL Synthetic Dirt Bike Oil’s superior performance helps instill in riders the confidence that their bikes will perform consistently in all types of riding conditions.

Racing is Reseach™

AMSOIL corporately sponsored supercross and motocross racers identified consistent clutch feel as a key performance attribute. Consistent clutch feel is critical to motocross riders during starts to keep the bike from lurching forward prior to the gate dropping. Trail riders, meanwhile, need consistent clutch feel to confidently navigate obstacles without having to shift gears and lose momentum.

Shear Stability

High-revving dirt bikes can tear apart the molecular structure of motor oil, resulting in viscosity loss. Most four-stroke bikes use a shared sump that supplies oil for the motor, transmission and primary chaincase. Transmission gears can cause shear-induced viscosity loss if inferior oils are used. Oil that has lost viscosity can fail to develop a strong lubricating film on metal components, leading to wear. AMSOIL Synthetic Dirt Bike Oil’s durable synthetic base oils naturally resist viscosity loss due to mechanical shear.

Protects Gears Against Wear

By retaining its viscosity despite high heat and shearing forces, AMSOIL Synthetic Dirt Bike Oil guards against gear wear for maximum component life, helping riders get the most out of their bikes.

Replaces More Expensive Oils

AMSOIL Synthetic Dirt Bike Oil is a high-performance replacement for more expensive, imported OEM-branded oils.

No matter the conditions or the bike, AMSOIL synthetic motorcycle oils deliver the premium protection and performance your bike deserves. They are designed to control oxidation and maintain viscosity at higher temperatures, promote consistent clutch feel and lengthen clutch life, reduce engine stress and control wear and deposits in high-compression, high-temperatures motorcycle applications.

AMSOIL Dirt Bike Products

To satisfy the demand for dirt-bike-specific oil, AMSOIL developed Synthetic Dirt Bike Oil in three viscosities, including 10W-40 (DB40), 10W-50 (DB50) and 10W-60 (DB60). 

AMSOIL Synthetic Dirt Bike Oil is designed to deliver consistent clutch feel and improve the performance of both bike and rider. Superior clutch consistency lets off-road (trail) riders expertly navigate trail obstacles without sacrificing momentum, helping them stay at the front of the pack. It also allows motocross racers the control needed to accurately time the gate drop to grab the holeshot. 

Synthetic Dirt Bike Oil

SAE 10W-40
4 Stroke

Honda, Yamaha, Suzuki, and Kawasaki 
SAE 10W-50
4 Stroke

KTM, Husqvarna or any dirt bike calling for a 10W-50 
SAE 10W-60
4 Stroke

KTM and Husqvarna or any dirt bike calling for a 10W-60
2 Stroke

- Provides outstanding film strength
- Delivers maximum power
- Burns clean

Fuel Additives and Carburetor Cleaner

Octane Boost

- Increases octane up to 3 numbers- Improves startup performance- Designed to increase power

- Cleans fuel systems
- Addresses ethanol-related performance issues
- Stabilizes fuel
Gasoline Stabilizer

- Helps keep fuel from deteriorating
- Protects against varnish and gum buildup
- Helps keep engines running at peak performance
Power Foam®

- Cleans combustion intake systems
- Maximizes horsepower
- Restores startability

Suspension and Transmission Fluids

Shock Therapy
Suspension Fluid Lightweight #5

- For quick rebounds under extreme temperatures- Maximum stability and performance
- Reduces wear and scuffing
Shock Therapy
Suspension Fluid Medium #10

- For more dampening and slower rebounds
- Maximum stability and performance
- Reduces wear and scuffing

AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil is a premium oil designed for those who demand the absolute best lubrication for their motorcycles. It is the result of extensive research and is specially formulated to excel in all areas unique to motorcycles, including the high temperatures of air-cooled engines such as Harley-Davidson* V-twins, wet-clutch lubrication, extreme-pressure regions of gears and chains and rust common to short trips and storage. 

AMSOIL Synthetic V-Twin Motorcycle Oil is multi-functional and fulfills the requirements of both domestic and foreign motorcycles.

Spray Lubricants and Cleaners

Silicone Spray

- Lubricates and protects nonmetal surfaces
- Locks-out moisture
- Will not attract dust or dirt
Metal Protector

- Disperses water
- Protects metal surfaces
- Penetrates existing rust build-up
Metal Protector
- Ideal for motorcycle chains
- Special rest and corrosion inhibitors
- Provides a dry, long-lasting protective coating
Miracle Wash

- Requires no water
- Holds dirt in suspension while bike is wiped clean
- Protects against UV rays
- Loosens grease & grime
- Fast-acting
- Leaves a clean scent
Chain Lube

- Outstanding protection against wear and corrosion- Helps extend chain life- Does not attract dirt