The mechanic said that when the last control arm bushing were installed they were tightened while the car was on the lift, this created a problem when the car was lowered the bushing twisted as weight was put on the front end. The car needs to have the wheels on the the floor with weight on them then tighten the control arm nuts, the bushing will last a lot longer.
I have heard this alot before but I always use urethane bushings. I clamp the cross shaft in the vise, tighten the bolts on the well greased bushings then move the A arm up and down while the cross shafts remains clamped in the vise. The bushings move freely with no binding, certainly no slope but no twisting.
The bushings have a sleeve next to the cross shaft, then the bushing, another sleeve pressed in the A arm. I don't see how I want the bushing acting as a damper by twisting every time the A arm is flexed. To me this bushing should not bind in any way and it should allow free movement of the A arm but still have no play.
I have done them about a dozen times and always tighten in the vise, move it through a number of up and down cyles testing for binding then put on the car.