My 2009 BMW 750i kept turning the charge battery light so I bought a new battery at O'Reillys specifically for my model car and worked fine for a month or so then the battery discharging while vehicle stopped occurred and charge battery light , it has even died from no power on the highway then turned back on five minutes later, noticed a small oil leak when opened up the hood maybe the alternator got oil in it
What makes this problem better or worse?
Worse, when I turn on my sub and amp stereo system
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