Mercury - 100 Hour Maintenance Kit Bravo Three Sterndrive OEM Components 8M0147058. Overview. There's a certain confidence that comes with running a Bravo Three sterndrive. Between the dual-prop control, the smooth bite in tight turns, and the steady push when the water gets choppy, it's a system you come to rely on. But even the best drivetrains need steady care. The Mercury 8M0147058 Bravo Three 100 Hour Maintenance Kit bundles all the essentials into one clean, well-built package. It's the ki