Our duet washer is 10years old and we have done nothing with it , except clean the drain trap in front. 1 shock looked dis colored on the metal part. We replaced all 4 shocks and it fixed the extreme vibration. Spins like new! The job only took 1 hour , start to finish! Each shock took a couple minutes to replace. The most time consuming part was taking it out of our tiny laundry room to work on it.