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I kept a spare in my trunk for two years in the southeastern US and I never had a problem (YMMV). This, like most things in life, is not perfectly safe. So you should decide if you really need to...
Answer
I kept a spare in my trunk for two years in the southeastern US and I never had a problem (YMMV). This, like most things in life, is not perfectly safe. So you should decide if you really need to...