1. Top off your levels.
Fill your gas tank and add a fuel preservative. The full tank keeps out moisture, and the preservative keeps the gas from breaking down. Take one last drive to circulate the preservative.
Make sure your antifreeze is fresh and topped off.
To avoid a nasty sludge in the spring, change the oil
2. Take preventative measures.
Give your car a good wash and wax to protect the paint. Protect the chrome with wax or paint sealant.
Over-inflate tires to avoid flat spotting, or jack up the car to take pressure off the tires.
Put a battery manager/tender on your car.
To prevent rodents from nesting in an engine compartment, try a rodent repellent under the hood. Just remember to remove it before starting up.
Put down a few moisture pads on the upholstery to absorb moisture and prevent mildew.
Cover the car with a breathable car cover to prevent corrosion and rust.
3. Re-circulate your oil.
When a car sits, oil settles into the pan, leaving the engine without lubrication. Disconnect the coil wire and crank the engine over several times. Reconnect the coil wire and you should be good to go.