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Audi RS-6 vs Lexus IS: 5-year value retention (67% vs 67%), resale value, and cost of ownership head-to-head. Audi RS-6 holds its value better.
On five-year value retention the Audi RS-6 comes out ahead, holding about 67% of its value versus 67% for the Lexus IS. Over the first five years the Audi RS-6 loses roughly $42,739 while the Lexus IS loses about $13,732 — a gap near $-29007.
First-year drop is the biggest factor: the Audi RS-6 sheds about 3% in year one versus 5% for the Lexus IS. If you buy used, the steeper early drop is what the original owner absorbs.