Mercury - 100 Hour Maintenance Kit V6 & V8 FourStroke Series OEM Components 8M0149929. Overview. Any boater who puts real hours on the water knows there's a certain comfort that comes from staying ahead on maintenance. When you're running a Mercury FourStroke-especially a V6 or V8 that pulls hard, idles smooth, and carries you across long miles-you want to know everything beneath the cowl is ready for the next run. That's why this kit matters. The Mercury 8M0149929 100 Hour Maintenance Kit keeps