I am officially scared to death...I really don't have the option of having different tires on at this point.

The other question I have is this, if I end up having to have chains on, do I need them on all tires? or just the back (or front) ones?

I do understand DSC should be off once on chains.

I also have a '99 328i, it is obvioulsy not 4x4 but it has Michelin S+M tires on, am I better off?