Mercury - MerCruiser 8.2L MPI 300 Hour Maintenance Kit Precision Service Kit Marine-Ready Components 8M0147071. Overview. Anyone who runs a MerCruiser 8.2L MPI knows there's a certain moment when you ease the throttle forward and feel the whole boat settle into its rhythm. When everything is right, the engine feels strong, steady and ready for whatever the day brings. That trust does not happen by accident - it comes from taking care of the machine that carries you across open bays, long channel