According to Yamaha's official recommendations, the engine oil for the Yamaha Saluto should be changed at every 3000 kilometers or 3 months, whichever comes first. It's important to follow the manufacturer's guidelines for oil changes to ensure proper lubrication and maintenance of your motorcycle's engine. Regular oil changes help to keep the engine running smoothly and extend its overall lifespan. Additionally, it is always a good practice to consult the owner's manual or contact a Yamaha authorized service center for specific information regarding your bike's maintenance schedule.