How often should the oil be changed in a boats engine?

The oil in a boat's engine should typically be changed every 50 to 100 hours of operation, or at least once a year, depending on usage and engine type. It's essential to consult the owner's manual for specific recommendations, as factors like engine conditions, type of oil used, and operating environment can influence the frequency. Regular oil changes help maintain engine performance and longevity. Always check the oil level and condition regularly, especially before long trips.