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Blanket statements by BOTH of you are likely wrong:
The newest BMWs with IBS and load control modules have demonstrated problems when trying to jump start with any power source. (AAA, another running car or a booster) Sometimes.
Older BMWs - 'many'- will jump fine. Or use a booster box.
My 2012 wouldnt turn over, tried to jump it- no joy. Connected an AGM charger overnight, started the next day. Actually quite maddening.
Its just a car with a 12V system, right? Not quite.
Generally I agree that BMWs arent special; they dont need magic tools or high priests to affect repairs. But there is something odd with this aspect...sometimes... You ignore the POSSIBILITY at your own peril.
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