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      02-25-2018, 03:37 AM   #2
Asbjorn
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Drives: Z4 N54 DCT (VTT GC lites)
Join Date: Mar 2012
Location: European in China

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Your local stealership has a battery tester that can determine if your battery is getting weak. I have changed mine twice since 2009, and noticed the last one was an upgraded bigger battery than the previous. A fresh battery def helps with laggy cold starts as long as you do not park the car for too long. Remember programming is needed after changing battery.
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