AMSOIL Synthetic Dirt Bike 10W-50 OilAMSOIL Synthetic 10W-50 Dirt Bike Oil is designed specifically for KTM or Husqvarna motorcycles and other makes requiring a 10W-50 for use in motocross, enduro, trail riding, supermoto, road racing and more. This 10W-50 enhances performance and improves engine, transmission and clutch reliability. A potent substitute for Motorex 10W-50.

AMSOIL 10W-50 Synthetic Dirt Bike Oil package sizes include:

  • Single US Quart Bottle
  • Case of 12 US Quart Bottles

We can offer AMSOIL Synthetic 10W-50 Dirt Bike Oil at the lowest prices in Canada or the US. Request a wholesale price list using the contact form on this page.

Suitable Applications for AMSOIL Synthetic 10W-50 Dirt Bike Oil

This product is ideal for any 4-stroke KTM, Husqvarna or other brands requiring a JASO MA 10W-50 motorcycle oil. This oil is an elite replacement for the following 4-stroke motorcycle oils:

  • Motorex Cross Power 4T 10W-50
  • Bel-Ray EXS Synthetic 10W-50 Superbike Motor Oil
  • Motul 7100 4T 10W50 Motorcycle Oil
  • ELF Moto4 Tech 10W-50 Motorcycle Oil
  • Castrol Power RS Racing 4T 10W-50 Motorcycle Oil
  • Lucas 10W-50 Synthetic Motorcycle Oil
  • Repsol Moto 4T Synthetic 10W-50 Motorcycle Racing Oil
  • Silkolene Pro 4 Synthetic 10W-50 Motorcycle Oil

AMSOIL Dirt Bike 10W-50 is ideal for the following:

  • Motocross
  • Trail Riding
  • Desert Racing
  • Cross Country
  • Enduro
  • Supermoto
  • Flat track
  • Speedway
  • Trials
  • Road Racing
  • Street

About AMSOIL Synthetic 10W-50 Dirt Bike Oil

The rigors of off-road riding and racing are very demanding on components such as engines, transmissions and wet-clutches. This off-road formula is specifically designed to provide consistent performance and improved wear control under severe operating conditions.

Promotes Steady Clutch Performance

Heavy sand or muddy conditions can fry a clutch in mere minutes. AMSOIL made clutch fade resistance a top priority when designing this oil. This oil’s ability to dissipate heat and retain its frictional properties protects clutch plates from expanding or warping. Expect steady clutch lever feedback and maximum hook-up until the checkered flag waves.

Clutch plates using AMSOIL Dirt Bike Oil

KTM Dirt Bike

AMSOIL Synthetic 10W-50 Dirt Bike Oil is the perfect 4-stroke engine and transmission oil for KTM motorcycles. (photo credit:

Provides Silky Shifting and Resists Gear Damage

AMSOIL Synthetic 10W-50 Dirt Bike Oil’s 100% synthetic formula provides noticeably smoother shifting. Down-shifts under heavy braking and up-shifts at full throttle are improved. Anti-wear additives protect gear surfaces from metal-to-metal damage.

Steady Viscosity in Extreme Heat

During very hot days, lesser oils shear down, leaving engines, transmissions and clutches vulnerable to damage. AMSOIL Synthetic 10W-50 Dirt Bike Oil maintains its viscosity in the face of long periods at full throttle on the hottest days imaginable. Engines and gears are protected and clutches operate fade-free.

Service Life of AMSOIL Synthetic 10W-50 Dirt Bike Oil

AMSOIL 10W-50 Dirt Bike Oil should be changed at the interval prescribed by your owner’s manual.


AMSOIL 10W-50 Synthetic Dirt Bike Oil (DB-50)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)18.1
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)121.9
Viscosity Index (ASTM D-2270)165
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)5.5
Pour Point °C (°F) (ASTM D-97)-38 (-36)
Flash Point °C (°F) (ASTM D-92)258 (496)
High Temperature/High Shear Viscosity @ 150°C , 1.0 x 106 s-1), cP (ASTM D5481)4.9
AMSOIL Synthetic 10W-50 Dirt Bike Oil
A 10W-50 oil for KTM motorcycles and other dirt bike requiring a 10W-50. Formulated for the specific conditions of dirt biking and motocross racing.
Manufacturer: AMSOIL
Model: Synthetic 10W-50 Dirt Bike Oil
Product ID: DB-50