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Hi Jörg,

As Capta pointed out, most diesel engines last longer than their owners patience. You will learn more as you go.
Dielse engines on sail boats are seldom worn out due to excessive use, rather the other way around - too little use is dangerous. Rust is another threat.

A leaking plug is not good, as it leads to oil in the boat which smells bad - I have never liked that smell. This is the worst of that part; as Capta said, just fill up more oil when needed.
But I think you should fix this, as it is not difficult. If the threads fit as they should, then it is just a matter of getting something to stop the oil sipping out. There are different posssibilities, either something solid or some liquid which hardens. Guess the temp in this area never exceeds 100 centigrade. (It is unusual that threading only is leakproof. The threads are used to get a mechanical hold, to get it leakproof something else has to be used. One example: To make the diesel fuel pipes connection to the cylinders tight often Cu metal rings are used, as Cu is rather soft. ).
In worst case, ask a [professionsal] mechanic.

From the information given so far it is not possible to say if the engine will last or not. Age? Condition? Use? Even with that info, it's difficult, inspection is necessary.
The other way to look on this is statistical. How many engines of this size and age are still used in sail boats? That would give a some kind of probability for your engine.

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