leaking from those Damn Relentless Contemptable moroons around here.
Also any oil leaking from the engine seals top and bottom.
Don't know if there is a way to check the health of the catalytic converters as I think of things that broke ten seconds after my warranty ran out on my last Audi...

2003 RS6 Daytona Gray, Silver Interior
RNSE
RS6 logo matts (waste of $$$)
RS6+ OEM 19" Titanium 5 spokes(summer)
RS6+ Dead Pedal
Stuck with it forever-depreciation rocks!
Go Gators
Future
R8 Phantom Black/Silver or Ibis- In longggg line
Former
2000 TT Coupe Neiman Marcus #25/100
2001 BMW X5
1994 Audi Cabriolet