Many modern vehicles do not have places to install a 120 volt immersion heater in the engine water jacket. An alternative is to use an external, stick-on silicone pad heater on the bottom of the oil pan. These heat the oil instead of the engine block, and aid in starting in extreme cold. There are lots of different makes and wattages available. Here is one sample supplier:
Wolverine Engine Oil Heaters - FAQ's
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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