I drive mine year-round in southcentral PA
and I haven't seen any rust (yet) either.
Phil '97 1.9 Montreal Blue
A 2001 with 95K miles in the Catskills - no rust!
Buffalo Pot Holes can be dangerous to a Z3...
...and I give you credit for driving your Z during our crappy Western NY winters. My Z3 is not driven in winters, simply because the lurking pot holes around here can swallow up large portions of the Z3 in one gulp. I hit one last week in my wife's Jeep that was so deep the off road skid plates took a hit. There are 2 other Z3s in the Buffalo area that I see now and then that are driven in the winter. One looks great- with no rust showing at all. The other has some stress corrosion type rust on the tops of the rear fenders. I suppose this may be from a combination of road salt mixed with snow, coupled with pot hole impacts, or it could also be from some prior collision repairs. Both of these Zs are 98/99 models.Doug