600 hours isn't a lot. I think it's a turbo engine
and probably runs at 1800 rpm
. My guess would be most loads at 50% or less meaning lower engine
temps. Probably good for 3000+ hours with proper operation and maintenance
and could be twice as much. Engines with turbos, run at full power (making 15kw) have much higher temps on the pistons, rings and cylinders, shortening their life. The generator
end bearing probably needs to be replaced every 5 years. They're sealed, but loose lube over time because of heat. You don't want the bearing to fail. Look in the manual.
The engine is probably used in tractor or industrial applications, too. Filters and parts
are cheaper from a tractor supply than a marine