Thus, it makes you hate your rental.
It does suck.

But they won't take it back, so try to have some kind of compensation, and maybe something in writing, in case you don't want to take your rental back there, or if you plan to exchange it for another brand...
Not having the original paint will lower the resale value.

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2010 X5 35d Black - Full (current)
2012 X1 28i (retired, won't be missed)
2007 335i sedan (retired, and missed)