Possible that they use both. I was once working for Audi as a project of my university were we designed the tools for front splitter of the S-Line models (Audi A4) and there we used Catia V5.
I was just messing around...those models didn't take me all that long...they arent very detailed, but it always fun to draw up some wheels. I would love to draw wheels for a living. As an engineer...most of the time i"m drawing some pretty boring parts. So its nice to mess around with something fun every once in a while. I'm still not very good with the spoke and hub designs...but i like playing around. I also use the program to draw up other parts...control arms, axles, calipers, rotors...things like that. Im sure it would be too difficult to render a whole car..tube chassis or something racy!
Cool. I never realized that there were so many CAD guys in here. I am a CAD admin at Thomas Built Buses (Freightliner, Diamler Chrysler). I've always been a ProE guy (we use ProE here at TBB) but the mothership (Diamler) has been pushing us to move to Catia V5. I've used Catia V5 a bunch but I still think ProE wins.
Great wheel models though! I definitely like Catia's rendering capabilities the best.