I replaced them in my 91 300TE at 210K and my dad's 95 E321T at 165K. Based on the amount of play they were obviously shot long before. I also replaced the rear wheel bearings on my 91TE at 175K (the right side of the car seems to take much more of a beating. The longevity of the heim joints doesn't necessarily surprise me but the wheel bearings does. I am convinced that the current front suspension and multi-link rear suspension set ups need to be totally re-worked about every 150K. You could piece meal it but the alignment costs and down time wouldn't be worth it. Mark