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We've got an E46 which is treated the same way and I leave it connected to a CTEK battery charger/conditioner. If you don't want to go that route then you should disconnect it completely. Car batteries do not like being 'Deep Discharged'. I've never bothered with oil and filter on the three or four month break in use, but if it was 6 months or longer then I would.
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Me:
Current: 2011 E71 40D Vermilion Red/Beige Nappa
Wifey:
Current: 2012 R80 Countryman SDX Green/Cream
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