Larry Dighera wrote:

Re ringing and doing valves are things that an air cooled engine may need
often, but a diesel will probably not need until it is replaced.

So the diesel is liquid cooled?

http://www.centurion-engines.com/

It's liquid cooled, so no discussion about shock cooling anymore.
It's fully FADEC controlled, so no overheating possible.
It's geared, so a prop strike doesn't affect the engine.
It's fully FADEC controlled, so always best prop pitch to the chosen
power setting.
and and and... in short, everything I would expect from a modern engine.