How often do you change the oil on a 4 stroke outboard engine?

For a 4-stroke outboard engine, it's generally recommended to change the oil every 100 hours of operation or at least once a year, whichever comes first. However, if the engine is used in harsh conditions or frequently at high RPMs, more frequent oil changes may be necessary. Always consult the manufacturer's guidelines for specific recommendations based on your engine model. Regular maintenance helps ensure optimal performance and longevity of the engine.