do struts have a life expectancy? how do they wear out, and how do you know when to replace them. I have 2 FWD vehicles, driven 150,000 - 200,000 miles, over regular pot holed roads, both Dodge Colt (Mitsubishi) 1995 2 door coupe. The ride quality seems normal, and nothing unusual happens over bumps/speed bumps/potholes etc. is is time to replace them?