Answer
Jan 04, 2025 - 08:36 PM
You should change the oil in a Mercury 4-stroke outboard every 100 hours of operation or once a year, whichever comes first. Regular oil changes are crucial to keeping the engine running smoothly and preventing wear and tear, especially in saltwater or heavy-use conditions.
Make sure to also replace the oil filter during the service for the best results. If you’re using your outboard under tough conditions—like running at high RPMs or in extreme temperatures—you might want to check the oil more frequently.
