Which Power Steering Fluid?

[caminator]

I have an Audi A4 2.8L. I have seen on some websites that I need to get CHF11S for my power steering fluid.

After talking to someone, he assured me I needed CHF7.1 fluid. Can someone tell me what the difference is, and which one do I REALLY need?

Thanks

 

[AndyMac]

You need VAG mineral oil, available from VW or Audi dealers for £10. Don't use anything else.