Looked at a 2010 Argo Avenger HDi with the 31hp Kohler today. Chain tensioners, bearings, frame, etc. all good, replaced as needed by dealership. Engine has just shy of 800 hours, or right about 800 hours. No smoke, drove fine.

Realistically, how many hours is too many on one of these machines, particularly the engine? I get maintenance plays a huge part but at what point does one say that's just too much?