Car struts usually last between 30,000 to 40,000 miles. Car manufacturers and mechanics advise that drivers check the struts on their vehicles every 12,000 miles. Some struts have been known to last as long as 50,000 to 60,000 miles. This is a component that should be checked for safety. You will know if your struts need to be changed, because the suspension system in your car will not work as well as it used to and you will feel a sway when driving it around corners.