Mercury - 3.0L 150hp EFI FourStroke 300 Hour Maintenance Kit Complete Outboard Service Kit Premium Marine Components 8M0163132. Overview. If you run a Mercury 150 FourStroke, you already know how much trust that engine earns. It's the motor that gets you through choppy afternoons, long drifts over your favorite fishing spots and slow evening cruises back toward the ramp. But even the most dependable outboards need proper care - especially the ones that rack up serious hours. The Mercury Marine p