Called up a mechanic friend and asked him about this. The best thing to install in the x5 is the block heater (example: Defa Warm Up), basically is connects to the coolant hose and bottom of engine block....keeping the coolant warm. It also comes with a battery charger and cupe heater with the optional remote/app control. In Norway temperatures are at -20C now and with this system installed you'd have no issues.

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers