Mercury - 300 Hour Maintenance Kit MerCruiser 3.0L MPI OEM Service Components 8M0147062. Overview. Anyone running a MerCruiser 3.0L MPI knows the engine's charm: it's straightforward, fuel-friendly, and consistently dependable. But even the most reliable powerplants need deep, thoughtful care every few hundred hours. The Mercury 8M0147062 300 Hour Maintenance Kit gathers every critical service item into one tidy package, giving you the confidence that your MPI engine will keep starting strong, i