I did a search and I'm really amazed this hasn't come up before.
I've only driven cars with unassisted steering like twice in my life, so I'm relatively familiar with that whining noise the pump makes when it'd like some more fluid. Had the 1987 325 back from the mechanic for..about a week and a half, and two days ago it first started to wheeze a little bit during a turn. Today, if I so much as put pressure on the steering wheel, regardless of how far it's turned, the thing grumbles loudly. So I may have to replace something other than the fluid, but for now that's all.
So in the manual (6-19) it gives a big list of approved fluids of the Dexon formulation or whatever..is there some specific brand or 'grade' of fluid that the car would like most? The fluid that's in there now is probably a few years old, because the thing sat for quite some time before i bought and fixed it, so I was also thinking that if the thing isn't leaking, and it's still got fluid in it, that I should just haul off and change it all. Is there a drain plug on the reservoir, or would I have to syphon it out?
To recap: power steering fluid, which brand/grade does the 1987 325e enjoy; would it be wise to change all of it at once, and how might I do that most easily.