How often should marine engine oil be changed?

Changing the marine engine oil every 100 hours of operation or annually, whichever comes first, is considered best practice for maintaining the engine's health and performance. This recommendation is based on the understanding that oil degrades over time due to exposure to heat, moisture, and contaminants, regardless of the frequency of use. Regular oil changes help ensure that the engine runs smoothly, reducing the risk of wear and tear on internal components, which can lead to costly repairs or engine failure.

Routine oil changes also allow for the removal of particles and impurities that accumulate over time, further protecting the engine. By adhering to this schedule, boat owners can maintain better fuel efficiency and overall reliability of their marine engines, leading to a safer and more enjoyable boating experience.