I've always been told to keep the gas tank full and use Sta-Bil fuel stabilizer. They also make a bag of some sort to toss in the interior that keeps the mice away. If you're not going to drive or even start the car all winter it might be suggested to disconnect the battery from the car, I'm not sure. Disconnected or not you can keep a charger on it. I'd see what the others on the forum here say about the oil change as well. Couldn't hurt to change it though as far as I know. Also couldn't hurt to give it a good coat of wax.