I spun and slid into a ditch (luckily it was shallow) while I was coasting at about 30km/h (about 15mph). There was like maybe half an inch of snow on the ground. And I was coasting to slow down so I could make a U-turn to go back home. Car decided to do it for me. You will not make it to the ski hill and back again unscathed in the Z unless you have proper snow tires.
BTW, don't go off course on the ski hills.
Charles Carbon Black '95 TT '02 Honda CR-V "Bustermobile" Carbon Black '03 BMW M5