I think I would prefer an unheated garage as heat can accelerate rusting I believe. I may be wrong on this, so maybe someone can clarify.
Mine will be 3 months in an unheated, but insulated, garage and on the battery trickle charger.
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2018 340i xDrive M Perf Edtn Sunset Orange
Previous BMWs - 19 others since 1971.
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