AND how you operate the acessories (attachments). You can beat any machine to death or use it wisely. This may mean taking a "smaller bite", depth/angle adjustments or slowing down ground speed. Most important I believe is the proper engine RPM for a given attachment under the conditions of use.The key is in good maintenance.
Try 42 years! At least that's how long my Simplicity 3012V has been rolling along. Tiller,dirt/snow blade,10" breaking plow,cultivators,disc harrow and 48" deck so it gets a lot of use. The former owner had a small truck garden so it's had moderate to heavy use. The 12hp Briggs needed a new coil and a little cleanup but no internal work when I got it!If 15-20 is a realistic life span for garden tractor with light use, how much should I expect the life to be shortened with moderate to heavy use of ground engaging accessories?
I guess you cant say you didnt get your moneys worth there huh?
42 years... :thThumbsU