AMSOIL Synthetic Dirt Bike 10W-50 OilA reader asks: I have a 2012 KTM 990 Adventure that specifies a ridiculously expensive Motorex full synthetic oil. Does Motorex have additives specifically for some coating or other materials in the 990 engine? Do you have any feedback on using an AMSOIL product in this engine? I’m concerned about veering from the OEM oil in case the wear rate increases and longevity suffers.

Our answer: There is absolutely nothing special about the formulation of Motorex motorcycle oil that is specific to KTM motorcycles. Motorex just happens to be the factory fill and has had a relationship with KTM for many years. The recommended oil for your 990 Adventure is either a 5W-40 or 10W-50 motorcycle oil covering the JASO MA specification. We would recommend the professional-grade AMSOIL Dirt Bike Synthetic 10W-50 Oil as a high-powered substitute for Motorex Cross Power 4T 10W-50.

AMSOIL Dirt Bike 10W-50 possesses a wide variety of attributes that make it the ideal choice for KTM motorcycles.

  • Delivers the ultimate in wear protection
  • Resists shearing down in extreme heat
  • Reduces friction for maximum output
  • Combats clutch slippage and fade for maximum plate life
  • Provides smooth gear shifting
  • Flows exceptionally well during cold starts

We can assure you that AMSOIL Dirt Bike Synthetic 10W-50 will offer world-class performance and protection for your KTM engine and transmission. It will most definitely not be a step down from Motorex.