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Audi S6-Sedan vs BMW Z4: 5-year value retention (57% vs 57%), resale value, and cost of ownership head-to-head. BMW Z4 holds its value better.
On five-year value retention the BMW Z4 comes out ahead, holding about 57% of its value versus 57% for the Audi S6-Sedan. Over the first five years the BMW Z4 loses roughly $24,123 while the Audi S6-Sedan loses about $32,767 — a gap near $8,644.
First-year drop is the biggest factor: the BMW Z4 sheds about 0% in year one versus 14% for the Audi S6-Sedan. If you buy used, the steeper early drop is what the original owner absorbs.