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Audi S4 vs BMW Z4: 5-year value retention (61% vs 57%), resale value, and cost of ownership head-to-head. Audi S4 holds its value better.
On five-year value retention the Audi S4 comes out ahead, holding about 61% of its value versus 57% for the BMW Z4. Over the first five years the Audi S4 loses roughly $21,466 while the BMW Z4 loses about $24,123 — a gap near $2,657.
First-year drop is the biggest factor: the Audi S4 sheds about 0% in year one versus 0% for the BMW Z4. If you buy used, the steeper early drop is what the original owner absorbs.