Worn or Weak Shocks Shock absorbers need not be leaking to be worn out or weak. If fact, many people drive on worn or weak shocks without realizing it. While worn shocks will usually not stop you from traveling, they will reduce your chances of avoiding an accident. And the worse a car or truck handles, the more tiring it is to drive.
Mileage alone is a poor indicator or poor shocks.
Other shocks are still working reasonable well at over 40,000 miles. And if you purchase really good shocks you might get over 100,000 miles from a set. The best way to evaluate your shocks is to drive your car or truck over roads you are familiar with. Those roads should require cornering, braking and have a variety of rough and smooth surfaces. Don't rely on a mechanic or technician to tell you when your shocks are bad.