I just replaced my sway bar bushings last night (1989 260E) and it was about a 90 minute effort.
My left inner bushing had deteriorated completely, and I was hearing a rattling sound when going over small bumps.
But more important, when going over bumps, road strrips, etc. on left turns at highway speeds, the front of the car would become momentarily airborne and fly over the bump, landing about 2 or so inches to the right. I also noticed and felt considerable body roll (which is to be expected when the sway bar fails). Now the car is fine, just as tight and stiff as it used to be, and remaining solidly on the ground.
I also noticed that a persistent radiator leak began sortly after I noticed the above effects. Could the rolling/jarring caused by the failed sway bar have contributed to this?