[s-cars] oil leak onto cat

[jimk at spotgraphicsinc.com]

Hello,
After travelling longer distances (say, over an hour on the freeway), I
am noticing that on occasion I get a burning oil aroma and a little bit
of smoke after I shut the engine off.  Upon further investigation, it
appears that a few drops of oil are being dropped onto the passenger
side catalytic converter.  While reading the current Audi Driver
magazine, it appears that the S8 has a problem wherein the rear seal in
the transmission leaks a bit onto the cat once the car is completely up
to temperature, which appears to be the same issue that I am having.
That article states that it is not that big of a deal to fix (2-3
hours).  Is it the same/similar in our cars?  Anybody BTDT?  Or could it
be somtheing totally different?
Thanks,
Jim Klein
95.5 S6Avant
93 S4