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No Diesel engine in a pleasure craft has ever died from being worn out, they've all died from neglect.
I have a 99 400DA with 3116 Cat diesels. When I bought the boat I knew little about the engines or their history. I did all the maintenance items on the engines required from 0-750 hours to establish a maintenance baseline. I replaced the fluids, flushed the engine and raw water side, replaced the water pumps, removed and cleaned the aftercoolers. I had Cat come out and do the overhead adjustment and generally check over the engines. I've had no issues with the exception of a leaky primer and a bad fuel solenoid relay. They are simple mechanical diesels and that is what makes them so reliable. Another big plus is they use half the fuel of gas engines and have roughly 5 to 10 times the lifespan of a gas engine when well maintained.
Good luck.
Pete