I wouldn't be a bit afraid. When we traded our 9610s off they had around 2000 separator hours on. I wouldn't have hesitated to run those again. Maintenance is the key. There are lots of places to look for. I could give you a list. The price is what really matters. If the price is right, you can rebuilt a lot yourself. I would expect a combine engine to last 10,000 hours with no problem, if it was maintained properly.