Do nothing special. I've often left cars for that long and took no special
precautions, but had no problems. If the battery is in decent condition, it
will still be OK. Some cars do have a slight drain for clock and computer
so a trickle charger can't hurt.
Don't sound too sure about the time period. You can't be sure if in the
Common things I did when making 6-12 month tours overseas (Navy). Drive the
car for about 50 miles before parking it, gets all the water out of the oil.
Common if you don't drive much and live in a humid climate. Fill the tank,
and add one can of dry gas. Wash and wax the car. Buy a battery powered
(cigarette lighter) air compressor to inflate the tires, may be needed when
you come back if you have real slow leak. Store the car in a garage or
similar safe from the elements. Disconnect the negative cable from the
battery. Roll the windows up to keep the spiders out of the car while in
storage. Provide a set of car keys to person you trust. Pay up storage
fees and your car insurance well advance.
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