Another thing to keep in mind is loading. I have run many prime power generators in remote locations. I inherited one site that ran 90% loading (crazy, I know), engines lasted about 18 months. Replaced them with loading of 50%, and they lasted 15+ years, and are still running.
I know oversized costs more to loaf along, but rounding up (moderately) on expected use, can save a lot of grief.
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