How often should shock absorbers be replaced?

The severity of the roads upon which a shock has been subject to will have a huge effect on its functionality. As a general rule, modern shock absorbers should be at least checked every 30,000 kilometers and replaced every 60,000km. As this can be a labour intensive job, depending on the vehicle, it can be more cost effective to replace a set each time. Doing this will ensure more even wear over the lifespan of the units too.