Dirty power steering fluid: This a scam?

ok, i've done some homework for you.

indeed, our responsible and technically competent domestics do not recommend brake fluid changes. they do however support fluid condition testing, which is actually ok and amounts to pretty much the same thing. [engine oil change intervals, in the absence of analysis and testing, is based ona schedule. if you have hard data from testing and analysis, you can throw that schedule out of the window.

some have been doing that for about 20 years.

but yet again nate, it's not subject to /constant/ heating, or /constant/ increases in wear product burden because it's not in a torque converter, getting filled with clutch pack wear material, or combustion product. lifetime on power steering fluid may not be infinite, but it's easily up there with other sealed, low thermal load, low particulate applications and we're looking at 10,000+ hours usage without change. do the math on converting that to mileage, and you'll see why i'm saying that without any hard data to the contrary, you're just voicing superstition.

don't put words in my mouth nate - i never used the ones you just attributed to me. read again back through the thread.

but changing fluids based on superstition, i.e. one where you have absolutely zero evidence to support some kind of schedule the manufacturer does not state, and one for which you have no alternative reliable authoritative sources information, makes no sense.