Mercury - Bravo Two 300-Hour Maintenance Kit MerCruiser Sterndrive Service Complete Marine Components 8M0215916. Overview. If you've spent enough time around boats, you know a smooth-running Bravo Two sterndrive doesn't just happen on its own. It comes from steady upkeep-the kind that lets you push off the dock knowing your gear is ready for whatever the day brings. This 300-hour maintenance kit delivers that feeling. Everything you need shows up together, neatly matched and built to last, so yo