yea i store mine in the cold aswell,
how long were you lettign it run for ??
better off just pulling the battery and puttin in a decently warm place, dont put it on cement or someplace grounded, for some odd reason whenever i left my battery on the cement floor of my garage it just got sucked dead. the car will be better off just sitting and if you run it every week or two after you do the following
thinner oil just for warming up and idling, i use lucas to smother the parts for the cold start up.
make sure coolant mixture is tip top to avoid costly freeze damage.
take everything organic out of your car, EVERYTHING, miss 1 candy bar and the car will reek. i empty a box of mothballs in my hatch, backseat front seat, glove box and arround air vents.
if you can jack the car up off of the ground, or make sure you roll it back and forth a foot or so when you start it up to change the load on your tires.
fill the tank to the brim. leave no air in that gas tank.
cover it.
i been to busy to think about hte supra lately so its just kind of there. sitting, not running, man i miss hearing what a turbo SHOULD spool like. my auidi turbo sounds like a hamster wheel.
:drink1: 
