Mercury - 300 Hour Maintenance Kit L4 Verado Series Standard Finish 8M0130835. Overview. There's a certain peace that settles over you when your outboard fires up smooth and steady, especially after a long run offshore or a full day chasing the bite. That confidence doesn't come from luck - it comes from taking care of the engine that takes care of you. The Mercury 300 Hour Maintenance Kit for L4 Verado outboards brings all the essentials together so you can service your engine the right way, wi