These are my opinions. They are opinions only.
Lots of hours can be a good thing or a bad thing.
I generally like to use the number of about 100 hours/year as average. Less is not always better as that may mean the engine has just been sitting there. A boat which has cruised will have considerably more hours but that is not necessarily bad. Diesels like to be run.
I generally look at around 3000-4000 hours as a rough timeframe when a good overhaul might be required. But a diesel, kept in good condition and maintenanced properely, should run well beyond those numbers. Dad's Tayana 42 has a 42 HP Yanmar with 3600ish hours on it that runs like champ and hardly uses any oil at all.
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