31 00... Information on replacing shock absorbers: Procedure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 BMW 335xi, 2013 BMW 335is, 2013 BMW 335i, 2012 BMW 335xi, and 2012 BMW 335is. However, it is still accessible from the selected car via links, so may be relevant.
If one shock absorber is damaged, it is only necessary to replace both shock absorbers when the car has driven in excess of 80 000 km.
Exception: On all M-models, when a limit value is exceeded on one side, it is still necessary always to replace both shock absorbers on the relevant axle.