Bite the bullet and get a set of dedicated snow tires if you plan on driving it when the high temp is below 50 degrees. It's as simple as that. The stock summer tires are useless below those temps because the rubber compound hardens up and you won't have traction. The Z is my daily so I have a set of Blizzaks I put on and I drove it all last winter with no problems. Ground clearance is the true issue, though, so I work from home if there's a moderate amount of snow in the forecast.
I think some people run all-seasons on it and have no issues, but I felt better knowing that I had two separate sets of tires that were proven to be optimal in the conditions I was running them in.
On a lighter note, I get a discount on my HOA fees during the winter because I help plow the roads out with the chin spoiler.
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