I was driving my 330i Saturday night in light snow but on very icy roads. This is my 1st RWD car. I have Nokian NRW tires which have been great. There were no problems and braking was excellant. Then while going fairly slowly on a city street with a curve to the right, my back swung out left and it freaked me out. The ASC (no DSC) kicked in and I steered into the slide a bit and I straightened out fairly quickly but had there been oncoming traffic it may have been ugly. I have a couple of bags of salt in the trunk but maybe that isn't really necessary and actually contributerd to the rear sliding out. Any ideas.