Agh, a week in after the guys replacing the fluid, it ran perfect and smooth, then yesterday it went stiff again. I checked the fluid and it went from the green colour to black again. I'm raging, the guys want me to get a new steering rack but I'm not convinced that is the reason. I'd blame something that is harming the fluid. Might go and get some normal fluid in it for now to top it up again.

Does it have to be LR fluid?
Any ideas on what it making it black?