For me it's my first mower which is a Cub Cadet 1711 Super Garden Tractor with 44" deck mule drive, hydro drive, 3 pt cat "0" hydraulic lift. It is mostly used as a back up mower, but during this time of year when I'm doing all these aeration's it is in full duty. It is a tough old beast, and since it has been garage kept it is in really good shape. Only minor rust spots, and when I back off the aeration's I plan to do a little corrosion control work on it. Lets hear about your old, still in service equipment?