Is it ok to keep a spare tank in my car? If I put a fresh coil and juice in it and just leave it there only if my main tank has a coil burn out on me?
Would I have to use it every so many days or change the coil every so many days or would it be fine to use even if it's just been sitting there a month or more?
i honestly wouldn't recommend it.. temp and air pressure changes can cause it to leak. i would leave some juice out of the sun in a bottle and spare empty, but setup tank.
Gotta agree with Cheallaigh on this one
I've kept filled tanks for over a year in the house and then vaped them with no issues (other than really well steeped juice

). I've kept empty and cleaned tanks on the shelf for years, then filled and vaped them with no issues.
For storage in a car I would keep the tank empty and fill and use when needed. Temps in a car are not going to hurt the tank.
If you keep a filled tank in a car temperature change is definitely going to cause leaks. It's OK if you don't mind the mess ... but it would bug me.
Best of luck with it!