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Audi S5-Cabriolet vs Audi S6: 5-year value retention (67% vs 51%), resale value, and cost of ownership head-to-head. Audi S5-Cabriolet holds its value better.
On five-year value retention the Audi S5-Cabriolet comes out ahead, holding about 67% of its value versus 51% for the Audi S6. Over the first five years the Audi S5-Cabriolet loses roughly $21,813 while the Audi S6 loses about $37,419 — a gap near $15,606.
First-year drop is the biggest factor: the Audi S5-Cabriolet sheds about 7% in year one versus 0% for the Audi S6. If you buy used, the steeper early drop is what the original owner absorbs.