In my last trip to the shop, the mechanics told me that I should replace my shock absorbers. When I inquired as to why, I don't feel that they were very clear with their answer, like they normally ...
I'm unfamiliar with car shocks. In motorcycles many rear shocks are charged with nitrogen which acts like a spring. I've seen motorcycle shocks that I've rebuilt have the correct amount of nitrogen ...
I have one (slowly) leaking shock. It was pointed out to me by a service place, and they also told me that they would recommend replacing both shocks (i.e. the left and right side) at the same time ...