As have I. The first symptom is a squeaky clutch lever. Eventually it leads to a failed clutch slave cylinder (you push the clutch down, and it doesn't come back up). Unlike Steve, I had mine replaced under warranty. :-)

Motul 600 has been working well in the S4, although I'm starting to wonder if I should opt for the better wet boiling point of the Castrol SRF. I've even had a little bit of brake fade with my Alcons (course, it was 100deg out, and my rotors/pads had lots of wear).

Perhaps it's the dye in the SuperBlue that causes problems? Hmmm...

Corey S
00 Nogaro S4