[Dante1]

Hello,
I decided to store my 440i for the winter and was wonder if there is anything specific I need to do before closing the garage door. I planning on keeping it in storage for about 4 months.

Thanks in advance

[Itogliano]

4 months isn't that long in the world of car storage. You don't really have to do anything, maybe hook the battery up to a trickle charger and/or cove the car if it's dusty (although car covers can come with their own problems). For reference, my summer car has been in the garage for about a month and a half now and will be through March or April. I haven't bothered to do anything with it and it's been fine in the past (i.e. last year. This is the second winter I've had the car)

[Billfitz]

A battery maintainer is a must.

[thejeremyman9]

Originally Posted by Billfitz

A battery maintainer is a must.

+1, some people also overinflate their tires by a few psi, especially if you are not going to check on the car regularly and are never going to move it.

[Dante1]

Originally Posted by Billfitz

A battery maintainer is a must.

I'm a little worried about a trickle charger because the car will be stored about 30 minutes from my house. Can I just disconnect the battery?

Edit: just found this in my garage.

[thejeremyman9]

Originally Posted by Dante1

I'm a little worried about a trickle charger because the car will be stored about 30 minutes from my house. Can I just disconnect the battery?

Edit: just found this in my garage.

That thing honestly looks pretty cheap... i would invest in a good one that you know is not going to overcharge, short out, etc.

[Dante1]

Originally Posted by thejeremyman9

That thing honestly looks pretty cheap... i would invest in a good one that you know is not going to overcharge, short out, etc.

That charger is 25 years old that I used on my Triumph TR-6. Any recommendations?

[thejeremyman9]

Originally Posted by Dante1

That charger is 25 years old that I used on my Triumph TR-6. Any recommendations?

FWIW the official BMW one is a rebranded CTEK. Based on that (and a huge thread discussing them in this section), that is what i went with. Exact one i purchased:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Make sure whatever one you get is compatible with AGM batteries, and do not run recondition on AGM.

[Billfitz]

You don't need to spend that much for a maintainer. This is 1 amp, which is all that's required:
https://www.amazon.com/dp/B07W46BX31...NsaWNrPXRydWU=

You wouldn't want to use it to charge a dead battery, as it would take at least 3 days, but it provides more than enough juice to prevent the battery from discharging while the car's not being driven.

[garyfried]

When winterizing I like to fill the gas tank completely and add some fuel stabilizer. Todays fuels containing ethanol etc goes off very quickly and may cause gumming up of the fuel system.

[karolp1993]

Is it a dry place? Component like brakes can be rust.

[Billfitz]

Montreal in winter is dry as a bone. Even if there's six feet of snow on the ground the humidity remains low until May.