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Mercedes-Benz SL holds its value better — 52% five-year retention against 52% for the BMW X6 M. Resale value and cost of ownership, head to head.
On five-year value retention the Mercedes-Benz SL comes out ahead, holding about 52% of its value versus 52% for the BMW X6 M. Over the first five years the Mercedes-Benz SL loses roughly $53,574 while the BMW X6 M loses about $61,150 — a gap near $7,576.
First-year drop is the biggest factor: the Mercedes-Benz SL sheds about 11% in year one versus 14% for the BMW X6 M. If you buy used, the steeper early drop is what the original owner absorbs.