These cars are getting old and the stock foam bump stops tend to rot over time and no longer stop the shock from bottoming out. I would inspect the bump stops. It may be as simple as some new bump stops. I agree with B21 that the shocks should be fine at that mileage.
__________________
2011 BMW Z4 35i 6sp wh/rd
2017 BMW M4 Comp DCT blk/blk
2001 Porsche 911 Turbo 6sp blk/blk
|