I usually bring here in Norway/Sweden in the winter: Collapsible shuffle, start cables, heavy duty tow rope, tow hooks, winter dress and blanket, extra gloves and hat, phone charger, ducttape, mounting strips, OBD scanner, basic tools, reflex west, LED work light, ice scrape for windows with brush, and a bag of sand/grit. And the car is prepped with coolant that can handle the cold, checked with a refractometer, washer fluid that can handle -30C, motor oil that can handle the lowest temps in the winter (0W og 5W here), block heater with integrated battery charger, and for the coldest days blocking of the passageways to the front radiator. Here nordic winter tyres are mandatory, anything else is illegal. Cross Climate tyres are really not worth anything compared to real winter tyres. And I wonder about bringing some sheet of stiff metal radiator mesh to be able to use under the tyres if I am stuck. I have in the last ten years used all of the above equipment in the winter, so it proves it was a real need for em. There is requirement from the government that winter appropriate diesel and petrol/ethanol to be sold in the months that it is needed. Never had any problem with that even down to -37C.
