If you have an oil-powered boat, it's important to know how long your oil will last. Depending on the size of your boat and the type of engine, you can expect to get anywhere from 50 to 200 hours of use out of a gallon of oil.
Of course, this is just a general estimate - your actual mileage may vary. If you're using your boat regularly and running the engine at high speeds, you'll probably burn through oil more quickly than if you're only using it occasionally and keeping the engine idling most of the time.
There are a few things you can do to extend the life of your boat's oil, such as changing the filter regularly and using a higher-quality oil. But even with proper maintenance, eventually you'll need to add more oil or completely change it out.