Groaning steering noise 2005 w211 270cdi

[Aidayboy]

Hi, the steering on my E270CDi seems to be making groaning noises as if there's maybe not enough fluid or belt. It particulary does it if your energetic with your driving/ steering then takes a while to run smoothly. I had an ML270CDi with same type of mileage and the steering rack collapsed, anyone had similiar issues with W211, it is due a D service, is this something they do in the service, how often should Power Steering Fluid be changed, car has 55k on it.

Worries owner

A.