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Audi RS-6-Avant vs Audi S5-Cabriolet: 5-year value retention (67% vs 67%), resale value, and cost of ownership head-to-head. Audi RS-6-Avant holds its value better.
On five-year value retention the Audi RS-6-Avant comes out ahead, holding about 67% of its value versus 67% for the Audi S5-Cabriolet. Over the first five years the Audi RS-6-Avant loses roughly $41,137 while the Audi S5-Cabriolet loses about $21,813 — a gap near $-19324.
First-year drop is the biggest factor: the Audi RS-6-Avant sheds about 5% in year one versus 7% for the Audi S5-Cabriolet. If you buy used, the steeper early drop is what the original owner absorbs.