BMW includes runflat tires i bought the same car and i assume if a tire goes that is not a runflat grade tire or whatever when u get a winter tire, that they will fock u over for not having a similarily OEM spec tire that u got on the car from the lot, specially if its required maintenance on a leased car like mine is .
sigh

i assume whatever winter runflats there are, are a must .
and being a RWD car the 323i, any winter tire should be a no brainer since its not an AWD version otherwise the xdrive cars would be better in snow for sure with all seasons .