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Audi RS-Q8 vs Mercedes-Benz SLC: 5-year value retention (57% vs 62%), resale value, and cost of ownership head-to-head. Mercedes-Benz SLC holds its value better.
On five-year value retention the Mercedes-Benz SLC comes out ahead, holding about 62% of its value versus 57% for the Audi RS-Q8. Over the first five years the Mercedes-Benz SLC loses roughly $18,981 while the Audi RS-Q8 loses about $54,481 — a gap near $35,500.
First-year drop is the biggest factor: the Mercedes-Benz SLC sheds about 8% in year one versus 12% for the Audi RS-Q8. If you buy used, the steeper early drop is what the original owner absorbs.