Springs are usually good for the life of the car...up to 500,000 miles. So no changing is usually needed for them. Mercedes shocks do last a long time...so your dealer might be right. Look to the anti-roll bars - front and rear -- to stop body roll in the corners. A larger rear bar will affect the front end plowing and create a crisper handling car. Check your suspension for worn rubber bushings or cracked parts. If any are found, you might want to firm up the ride with poly-urethane plastic suspension bushings. This will firm up the ride, but at the expense of comfort in the ride department. If you just want more response of the stock roll-bars, add stiffer roll-bar supports and/or links. Use poly bushings on the bar in conjunction with a stiffer bushing block (bolts to the car) and larger stiffer link pieces wherever needed (from the bar to the suspension). This will remove the "slop" from the handling and create a crisper ride....as to turn in or transition from lane to lane (flat ride angle transition to leaning angle--as in a curve)....so that you will not feel the car shift over onto its side and try to loose it suddenly.
Think of it as forcing the car to gradually assume its cornering stance instead of obtaining that "tilt" in a herky-jerky motion. You therefore feel a more competent and less -"on the soap" - motion within the auto.
Regards
Think of it as forcing the car to gradually assume its cornering stance instead of obtaining that "tilt" in a herky-jerky motion. You therefore feel a more competent and less -"on the soap" - motion within the auto.
Regards