Two questions about a Motor Coach we are looking at

I have a genset that runs 9 hours a day, 5 days a week, and is going on its 6th year of service. It is an Onan 10K diesel. The hour meter actually quit working. You can hear it click once a second but the numbers no longer scroll. This unit gets new oil, filters, and fluid every 4 months. IMHO it is not the hours you should be worried about it is the service records. If there are good service records I would not worry about the hours.