I just replaced the four bushings on my front sway bar and I noticed a significant difference in the stability of the car while cornering, even at low speeds. It took all of 40 minutes to do it in my driveway (I was talking on my cell phone at the same time). My dealer charged me $37.84 for all four bushings. I didn't even need to jack up the front of the car--There's no load on the sway bar with the car in its normal position.

I'm planning to do the steering damper next as it was pretty sloppy when I checked it.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles