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Audi S4 vs Audi TT-Roadster: 5-year value retention (61% vs 61%), resale value, and cost of ownership head-to-head. Audi TT-Roadster holds its value better.
On five-year value retention the Audi TT-Roadster comes out ahead, holding about 61% of its value versus 61% for the Audi S4. Over the first five years the Audi TT-Roadster loses roughly $21,957 while the Audi S4 loses about $21,466 — a gap near $-491.
First-year drop is the biggest factor: the Audi TT-Roadster sheds about 7% in year one versus 0% for the Audi S4. If you buy used, the steeper early drop is what the original owner absorbs.