Its interesting, I buy with the intent of getting atleast 15 years out of the unit, any additional time is a plus. Unfortunately, I have a limited buget for lawn equipment so I look for the heavest duty in the less expensive brands such as Sears and Husqvarna. I will not accept anything less than a garden tractor. I have been fortunate with these tractors all have held up well. I have always changed the oil at the start of the season also change the air filter, plugs and fuel filter. The only short coming has been the fact that there was no hour meter. I did install one in my case tractor and found it helpful. My newest tractor has a meter and I think this will add some longevity to its useful life. If nothing else I will change the oil more often.