I just think the potential of it doing something unattended is much higher with it there than not. My comment about temps was not that the copper was in danger just that these 535s run hotter than most cars and doing anything that might upset the cooling just isn't worth it.

It probably is fine and will never cause a problem - I just wouldn't leave it if it were my car

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2008 535xi:
Sport, Night Vision, NAV, PDC, HUD

Mods
Rear Seat Heat Retrofit, Passport 9500ci, HD Radio Retrofit
Shock Sensor Alarm, Sport Automatic Retrofit , Active Backrest Retrofit, Fire Extinguisher, PROcede with Meth Injection