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      01-08-2013, 02:06 PM   #21

Drives: 2011 E90 LCI 328i xdrive
Join Date: Mar 2011
Location: Winnipeg/Minneapolis

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The way that my CA instructed me was that in our Canadian winters its harder on the battery than it is the engine on those frighteningly cold days. Thats why at my home dealer they install battery tenders as part of their PDI process. He said that with the synthetic oil there is always a layer of lubrication for the super cold days and it's been engineered to remain liquid even at -40 (Celsius or Fahrenheit), which is why our cars don't support engine block heaters anymore.

Thus, as long as your battery is charged, and in our harsh, cold, Canadian winters this means plugging in the tender every night, then you'll be fine.