[Biturbos4] Steering Rack Update

[Greg Amy]

OK, I'm confused.

Does Pentosin evaporate? I got home today and noticed that the spot
where the S4 leaked is "dry", as if it evaporated, leaving a light
stain. I'm done working on the race car for the week so I put the S4
on the lift, put my wife in it, and went up a bit while she ran the
car, moved the steering back and forth. Nothing, not a drop. The level
of PS fluid is at max (actually, slightly over). The rack boots are
dry, both sides. I had her put the A/C on full blast and got water,
but nothing else.

I'm stumped.

Could I have mis-diagnosed A/C drain as power steering fluid? Sure,
but why would it taste oily, have a very thin brownish color, and
leave a light, dry stain on the driveway?

I guess I'll just drive it and monitor all fluid levels. But in the
end I'll take this as a sign...

Greg