I forget how I got on to this subject, but I just installed this filter in the power steering system of the Dodge SUV. Very simple to do, just cut about 3" out of the return line to the pump.
Fellow GJ'er Torque1st preached the benefits of this filter more than once.
http://www.garagejournal.com/forum/showthread.php?t=34679
I'd thank him, but he seems to have left us in some definition of the phrase.
The down side to these is they're not cheap, considering they're wee and plastic. Wix, # 58964, cost me $14.86 from amazon. But it's not like you have to change them often. I'm sure production volumes are low.
Grumble grumble oil filters at Wal Mart are $3 grumble grumble.
Trivia I learned in the amazon comments: these are magnetic. People are tearing them apart and not finding magnets in them, but somebody in amazon comments found/noticed the patent # and Wix has found a way to put magnetic material into the plastic itself.
I first learned of these when shopping for a reman P/S pump on the internet about a year ago. I thought I was being upsold. I eventually realized, nah, it's not a bad idea, and why the heck not? My nicest car has a P/S filter from the factory, and that's a factory who has, let us say, a long-term view on car durability.*
Even more trivia: the vehicle was around 275K mi and I was changing out its Saginaw P/S pump when I realized, yeah, these return hoses are getting old and stiff from the heat, and are dirt cheap to replace, so I replaced them. Now, at 295K or so, splicing in this filter with some new "roto clip" type hose clamps, fast, easy, no leaks. I know I'm already a weirdo, but really, I do like spring steel hose clamps.
Also, those Vacula or Pella-type oil extractors are just the thing for P/S work. **** the reservoir out, you have much less dribble when you start working on hoses downhill from it. Or, a quick and dirty partial fluid change.
UPDATE: See post #315 for more.
.