PS fluid is indeed the same as your ATF fluid. I am not sure of your year for the S70, but the earlier models used Dexron, Motron whatever.
I would flush it rather than dribbleing a little bit out of the bottle. The reservoir bottle has 2 lines going into it, the top one is from the steering gear(output) and the bottom one is for the pump(input). If you disconnect the top line and feed it into a small pail while pouring fluid into the reservoir, that should work. At least it works that way for the 740.
There are probably better ways and if you look at the FAQ section...
Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)
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