I had an entry-level McCulloch that simply would not die. The throttle cable was frozen, the carb was dirty and leaked air, the head would overheat, etc etc, but it would not die, even after 20 years. I finally pitched it this year and bought a mid-line Stihl: what a great machine! Well engineered, well-made, and almost a joy to use. I hate corded yard appliances.
TC