My race car has been in storage for about a year now(not due to weather, but no track). It's probably more sensitive to long stays of inactivity than a new car. What I do is about once a month warm it up and run it around the block(neighbors love it). It doesn't have a lot of gas in it to avoid it turning to varnish. While in the garage I raise the car off it's tires to avoid flat spots. This is more of a problem on slicks than regular radials so probably not necessary for you to do. If your garage sees regular traffic a car cover might avoid some scratches if someone walks too close.
When you get it out in the spring, change the oil and check your coolant and other fluids. That should do it.
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