Keeping a car in storage for long time ?

I`m going to be away home for next six months or more. My car is Buick Regal GS 2002. I`ll keep her in the underground parking. First of all I think I should disconnect the battery. Should I disconnect (+) or (-) ? Maybe both? I`m worried that leaving the car without battery cause any problems. I need your tips on long term car storage besides the battery.

entirely and put it somewhere where there`s no chance of freezing. Also you might want to reconsider, some newer cars have to "relearn" lots of stuff if the battery is disconnected - might be better to put the car somewhere that you can run a solar charger or battery maintainer to it to keep it topped up (a fully charged battery shouldn`t freeze unless it`s bitter cold.) Other than that, make sure the antifreeze is up to snuff, run some Sta-Bil through the fuel lines to keep the fuel fresh, and if you can get away with it, put the car up on jackstands so the tires don`t go square (less of a concern with modern radials, but if one has a slow leak you won`t be happy) Plan on changing the oil when you "revive" the car, and it wouldn`t be a bad idea to change it right before storage as well. If it`s going in a damp environment, might want to look into possibly pulling the spark plugs, putting a squirt of oil in each cylinder, turning the engine over a few times, then reinstalling the plugs. An alternative is a dessicant that replaces the spark plugs - I believe Eastwood sells something like that.
That all said, I`ve not practiced what I preach - my Scirocco has been sitting unused for about a year and still starts every time I have to move it with just a boost. So while all my advice is good if you like to do things right, it`s somewhat unnecessary. good luck nate

If you are leaving the car for more than a couple of months, never, ever leave the handbrake on. It will sieze.

them to take it out for a ride once a week or so or at least get in the car and start it and run the engine for a few minutes once a week? That`s what I do with my car when I go away.

There`s an additive you can put in the gas tank that is supposed to stop this happening. Alternatively you can drain it. Definitely drain the oil.

The gas additive is called "Sta-bil". Most hardware stores sell it.

Day (my wives idea) been doing this for years...
I now use battery tenders on all the cars... Disconnecting the battery lead to frequent early battery failure (at least 2 every year had to be replaced)
I add Fuel Stabilizer to the gas tank
I change the oil the day I store them & Change it again the day I start them up
I over inflate the tires...
You may (I do not) place the car up on jack stands with the jack stands placed under the suspension points not the frame...
OPPS... I see you will be keeping the car in an underground garage not your private garage... !!! Forget the jack stands for sure.. and a battery tender will not work either...so remove the battery completely. (be aware that this will most likely reset you cars computer etc..but that will not or should not be a problem when you return) Do Add the Fuel Stabilizer and DO change the oil...
Also be aware that a lot of seals may dry out in 6 months and you may have a few fluid leaks when you put the car back on the road but these are generally very short in duration as the seals swell up..(power steering especially gives me fits)
Bob Griffiths (68 SS 396 Chevelle & 5 Corvettes are what I store btw)