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BMW M6 vs BMW X5-M: 5-year value retention (52% vs 52%), resale value, and cost of ownership head-to-head. BMW M6 holds its value better.
On five-year value retention the BMW M6 comes out ahead, holding about 52% of its value versus 52% for the BMW X5-M. Over the first five years the BMW M6 loses roughly $57,313 while the BMW X5-M loses about $58,936 — a gap near $1,623.
First-year drop is the biggest factor: the BMW M6 sheds about 10% in year one versus 13% for the BMW X5-M. If you buy used, the steeper early drop is what the original owner absorbs.