Congrats on your purchase.
In my opinion, you, like myself, are blessed having the best engine ever made.
The 6 BT5.9 is by far the most reliable engine I know. You really will have to go out of your way to kill this engine. Change the oil every 100 hours, keep the water flow going by changing the impeller, check or replace your heat exchanger and you’re good to go.
The mechanical fuel injector is the lifeline of this engine. Sometime in the next 300-500 hours, ( if not done previously within the past five years or 400 engine hours), I recommend pulling and brining it and your injectors to a fuel pump rebuilder. They will check, calibrate all components. Aside from that you are good to go.
This engine will outlive you and your children.