I've owned my '49 8N for 17 years and just now put it up for sale due to buying a newer/bigger '58 Ford 861D last year to replace it. My little 8N has always been a welcomed work horse when needed, but due to her age, she has always been a little needy in the maintenance department. The good news are, they are simple to work on and most parts are so robust that they seldom get to the point where total replacement is needed. Another big plus is that all the parts are still available. I doubt many new tractors will have a 66+ year working life span like the old Fords.