Most TK reefer ate flawless until 20,000 hours if maintenance is done as required. After that it starts to need a bit more but should be fine. Keep the oil full it will burn some near 25,000 hours. Near 30,000 hours you may need a new compressor. You want to know what is scary running a 30,000 hour TK at -20° for 4 days on an ice cream run. And to top it off my carrier did not have insurance for ice cream loads.