Mercury - 100 Hour Maintenance Kit MerCruiser 4.5L V6 & 6.2L V8 Complete Service Components 8M0147052. Overview. There's a certain ease you feel when you know your engine is taken care of - the kind that settles in when you turn the key and your MerCruiser lights off with that smooth, confident rumble. That peace of mind doesn't come by accident. It comes from staying on top of routine care, especially the 100-hour service that keeps everything running tight, clean, and ready for the next stretc