The engine is the same one used in non-tractor commercial service... in many applications it can run for many thousands of hours with regular service. The hydraulics and HST are Kubota built and seem to be quite rugged as well if maintained properly. There are lots of 10+ year BX's...mine's been totally dependable. Note that's getting to the age when some things start to wear out... bearings, seals, hoses, etc. Pretty much typical for equipment like this and generally repairable. Bottom line, if you keep it well maintained and realize it's not a D9 Caterpillar, it should last indefinitely. Maintenance items: Engine and tranny oil and filters. Keep the HST fluid full and clean. Use only Kubota SUDT-2 trans fluid - no substitutes. Air filters... diesels hate to eat dirt. Fuel filters (both) every few hundred hours. Keep the grease fittings on that mower deck well lubed. Change oil in front axles as scheduled. Get an owners manual if not with the tractor, and read, read, read. A known weak spot: there's a plastic cooling fan on the underside between the engine and tranny. Blades get broken if you run it through brush and sticks. A pain to replace. If you will be doing any of that, invest in an aftermarket skid plate for protection. If you're not headed into the boonies with it, not necessary.