For the KTM Duke 200, it is recommended to use engine oil that meets the manufacturer's specifications outlined in the owner's manual. The specific recommended oil can vary depending on the model year and any updates provided by KTM. However, a commonly recommended engine oil for the KTM Duke 200 is a fully synthetic 10W-40 motorcycle oil that meets the API SN or JASO MA standards.
To ensure that you are using the correct oil, it is best to consult the owner's manual or contact an authorized KTM service center for the most up-to-date and accurate information. They can provide specific recommendations based on your bike's model year and any specific requirements or updates. Following the manufacturer's recommendations will help maintain the performance and longevity of your KTM Duke 200's engine.