Do the oil service before storing it. Acids in the old oil aren't good for the engine

Either tire regular inflation spec or 5 psi over, but remember to reset them when you take it out of storage

Battery tenders need utility grid power. Skip it. Batteries become unusable if they freeze once they go flat. If it regularly goes flat you can disconnect it. Original battery?

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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