I was planning to service my power steering too. When I remove the cap/dipstick, just inside the reservoir is a white collar ring with a narrow hole in it for the little dipstick to go in. Is that the filter? If so, how do you remove it? If not, it looks like I would need to remove the white collar to get down into the reservoir.

ETA: Mine looks like the lower diagram, with Nos. 17 and 20, and Part 162 being the cap/dipstick.

Is it possible mine does not have a filter at all?
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-- Paul W. (The Benzadmiral)
('03 Buick Park Avenue, charcoal/cream)
Formerly:
'97 C230, smoke silver/parchment; '86 420SEL, anthracite/light grey; '84 280CE (W123), dark blue/palomino