How do I prepare my 2012 Nissan Murano for three months of winter storage
Slap a float charger on the battery, and top off gas and add some "dry gas" (or equivalent) to the tank. Three months is not long enough to bother with anything else. If you wanted to get a little carried away, jack it up and put the car on jackstands, so the tires won't flatten.
Defently a float charger, but I would also change the oil and filter just to get rid of any corrosives that maybe suspended in the engine oil now, plus fresh oil clings better to surfaces than used oil if it is going to sit for a while, instead of just plain old gas dryer I would use StaBil Marine in the fuel tank, this helps counteract the corrosive nature of the E10 fuel and keeps the fuel dry and stable while sitting. HTH
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