I have a bottle of PS in the trunk of my jetta, stays there all winter. There is a junk catcher compartment on the passenger side that works great to keep it upright. I also have one of the smaller bottles of PS behind the back seat of my Superduty for just in case situations, and come to think of it, stays there year round. The big bottle that is regularly used sits in a box in the bed. Lid on tight and the bottle upright, never had a problem.



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