"problems" concerning low hours...(sometimes these aren't big problems, take all of this with a grain of salt)
When an engine is not operated regularly, or has "long" periods of non-operation, condensation can work its rusty magic in cylinders that are stopped with valve open. On a 4 cyl. engine gas or diesel, this could happen in a maximum of 2 cylinders at a time, or a minimum of no cylinders. I haven't worked out the probabilities but given the action of the valves in relationship with engine rotation at least one valve (intake or exahust) will be open at any given time.
as stated above,
belts/hoses/filters/ plugs, points, coils
glowplugs/injectors filters/belts hoses
are subject to wear/replacement.
Look, this is all relative. You may go with a 600 hour engine in a 20 yr old boat and have no worries for another 10 years. Or you may go with a 3000 hour engine in a 20 yr old boat and still have no worries.
Or, the 600 hour engine may give up the ghost in 10 hours, same with the 3000 hour engine.
Get an oil sample kit and get it tested this will help you a bunch.
We are not primarily on earth to see through one another, but to see one another through
Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs