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I've done cross country trips in 4 different BMWs and the only problem I ever had was a sulphated Z3 battery in the Canadian Rockies. Some bystanders help me push start the car & I made it into the nearest town where I put a used $25 battery in as they didn't have one that fit correctly. That got me 200 miles to Edmonton and a BMW dealer for a proper replacement.
You might get AAA or another motor club coverage if you are nervous.
Tom
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