I believe that engine is an upgraded model of the 6LY 3STP that Bachus refers to above. I have had two boats with that engine and it was a very solid engine.
The 6LY STP and presumably the 6L3-ETP will give you thousands of hours of good service if you:
* Prop it correctly so it reaches 3,350+ rpm at wot
* Change the oil, filters, zincs as required and do all of the recommended maintenance
* Remove, disassemble, clean, grease and reassemble with new o-rings the aftercooler every five years. See SBmar.com, Tony’s tips, for info as to how to do this,
* Run it no faster on a continuous basis than 2,800 rpm’s.
David