Wet bought two nearly identical e53 X5. We used them both as daily but it was exceedingly helpful to have a "spare parts" host at times. Pulled parts more than once to make one operational. Also as one was older I got to practice a repair on one that I would be able to fix faster on the second go.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)