Couple o' questions (ATF in the oil, oil filters and Redline)

[Peter Henriksen <peterhe@microsoft.com>]

Well, more like three questions for the collective wisdom:

1) Where do I get Redline transmission fluid for my 91 200 and what kind
do I need?

2) What's a good oil filter to use on that same car?

3) (The weird one) My Acura (yes, I know, but the other 2 questions were
Audi...) seems to have a lot of sludge build-up. The dealership points
this out every time they see it and have been saying that there's
nothing I can do about it. However, the last time I was there I actually
talked to one of the mechanics and he suggested putting a pint of
Automatic Transmission Fluid (ATF) in with the oil for the next 3 oil
changes and do those 3 oil changes 1,000 miles apart. The ATF supposedly
contains a lot of cleaning agent(s) that will dissolve the sludge and
enable it to drain with the used oil. Does this sound reasonable to you
guys?

Thanks (in advance).
- peter, peterhe@microsoft.com, redmond, wa
  91 200qw
  94 acura legend gs
  80 mazda 626
  O-