Yeah try it definitely, I bought another litre and did 3 more flushes today with lots of driving between. Now the fluid in there looks about 90% new and the mild click click click i could feel (but not hear) on long sweeping bends seems to be gone.

I have replaced every single bush and balljoint in the front end chasing it, and the car was feeling solid but that 1 annoying click was always still there. It took me a while to even start looking at the steering system and the fluid was the first and simplest thing on my list as it was so cheap relative to changing parts out. Im glad I didn't buy a new rack first!

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'11 xDrive40d M Sport - 4-zone climate - Active cruise control - top view - side view - massaging/heated/ventilated seats - Powered bootlid - Comfort Access - BMW Advanced loudspeaker system - Rear side windows sunblinds - Adaptive headlights - Soft close doors - comfort seats - DAB digital radio - Panoramic glass sunroof - folding mirrors - High beam assistant - Head up display - Speed limit display - Lane departure warning system - 7 Seats - Digital TV - Internter - apps - USB