http://thinking-about-storing-my-car.html

If you are going to store your car for a period of more than two months, the following are recommendations to follow.

* Fill the tank with gas and add a gas stabilizer to keep your gas from becoming stale.

* Change the oil and filter.

* Thorough wash the exterior of the car, wheels, and tires. If possible, remove each wheel and thoroughly clean them. Especially the back side where dirt and road debris accumulates. Polish the wheels and reinstall. Polish/wax the exterior. Clean/detail the engine bay. When the car is sufficiently cleaned and the paint treated to a good coating of carnauba wax or polish, consider covering it with a quality car cover from California Car Cover or Big Sky Car Covers, or another high quality cover.

* To prevent tire flat spots, use jack stands to raise the car off the floor. Set the stands under the control arms so that the weight of the car is still on the suspension, and just high enough to keep the weight off of the tires. Putting the jack stands under the spring perches is recommended by many. If jack stands are not available you can use wood blocks. Just remember that the suspension likes to be loaded. It's heavy. Many recommend that you just inflate the tires to the max and put carpet squares under each tire.

* Check the tire air pressure and be sure all four tires are the same correct pressure. Note that regular air can leak during storage due to faulty valve stems, wheel irregularities, etc. Costco warehouse stores use nitrogen to fill tires. It is the only place that I know of that has nitrogen due to the expense of the equipment I guess. However, nitrogen is preferred for a number of reasons. The most important IMO is that it is heavier than air and is less likely to leak out (larger molecules). So if you have a Costco in your area consider replacing the air with nitrogen. You'll have more consistent air pressures without leaking.

* Disconnect the negative battery cable. When you're ready to take it out of storage hook it back up. Some prefer to use a battery tender.

* Place a few moisture absorber packs (desiccants) in the interior to absorb any moisture. Large packs are usually available at most do-it-yourself building supply or hardware chains. A couple of bags on the front and rear floors, as well as a few more in the trunk, and you'll have dampness protection for the entire winter season. As an alternative, kitty litter can be used in small containers.

* Get some Arm & Hammer baking soda to put in the cabin. Open the tabs and place the entire box on the floor. I'll put one box on the rear floor and one on the front floor. This will prevent any musty smell.

* Cover the car with a high quality car cover. The cover will keep the paint surface clean and protect it from scratches if you (or others) will be working around the car.

* Inflatable bubble covers are also available. You basically drive your car into the bubble and inflate it. Users state that air is continually kept flowing through the bubble and this totally keeps out all moisture. So rusting of the brake rotors, for example, is not an issue. I don't know anything more about this method so you should research it before using it.

* Change your oil again when the car comes out of storage.

* When starting the car after long term storage, hold the accelerator to the floor (which will turn off the fuel injectors) while starting. Turn the car over for about 10 seconds to get the oil flowing to the top of the engine. Then start the car normally. It is also recommended to pull all the plugs first so the starter isn't working against compression. It is my understanding, though, that if you have a BAP it can render this trick useless, reportedly due to the upgraded wiring coming directly from the battery.