Wow, Just to read your post is depressing. I am lucky to live where I currently do. In Pa. where I am from, I would be looking at a couple months like you are.

I have to agree with harbor and drive it once per month if you can. I am told the worse thing you can do to a car is to have it sit and not run it and bring it up to full temp. once in a while. I say this while I used to do what AMX mentioned all my life with cars and motorcycles... but the best choice is to run it. Don't just leave it idle, it needs driven if you choose this option. Internally, the car, motor both draw and accumulate moisture based on temperature fluctuations. Not good.

Either way, I would put a couple coats of wax on it, lube all rubber componants, use either a heavy dose of Marvel Mystery Oil in your gas and keep your tires pumped to the max accpetable pressure. As far as the additive in the gas, make sure you have a full tank upon storage or moisture could form on the walls of the gas tank inside then transfer to the gas. Make sure you drove it a few miles whith the Marvel in it so it will bethrough the entire fuel system upon storage.

If you can't drive it once per month, I would use a fuel stabilizer rather than the Marvel. I would also remove the battery and do not store it on concrete over the winter. Keep it charged up. The biggest issue is the dry start that will ocur in the spring when you first start it after 5 months. Not good. To help somewhat, you could have someone spray WD-40 way down into the throttle body as you crank it over for the first time. This will help with upper cylinder wear for the first few seconds. Make sure the red tube does not fall in.

This may not cover all but this is a start for what I would do.

Steve