I asked a Cummins/onan service repair shop how many hours was a lot...he answered by saying at a thousand hours they suggest a full service, belts, oil, filters, coolant and thermostat. He never went so far as to say how many hours was too much but he offered his personal observation that gens on slides get serviced and gens bolted in rarely do, because of high labor costs. I have never seen a gen with that many hours and would want to see the service records for it (the gen). I think I would go to a onan dealer and ask about hours and also the price of a new one, it might make a difference in your offer to the seller.
