Audi S6 (C6) V10
Why 6.2: DougScore 56 for a V10 Audi borrowed from the Gallardo parts bin and never repeated in another S6 — every generation before or since used a V8 or a turbocharged six. Values have fallen off a cliff since, turning a genuinely exotic-adjacent drivetrain into one of the cheapest ways to own a Lamborghini-related engine.
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Market value
Median asking price, good condition · €71k (2008) → €16k (2026), trending down · illustrative data
The long version
The C6-generation S6 borrowed its naturally aspirated V10 from the Gallardo parts bin, detuned and reworked for a Tiptronic automatic and quattro all-wheel drive, and Audi never repeated the experiment — every S6 before and after has used a V8 or a turbocharged six. That drivetrain came with genuine complexity: timing-chain and tensioner problems earned the V10 a reputation that tanked resale even faster than a big, thirsty sedan usually manages, and today's used market treats it as a cautionary tale rather than a Q-ship curiosity. The buyers who do own one tend to know exactly what they're getting — a Lamborghini-adjacent engine note in a practical AWD sedan, bought at a price that assumes a major service bill is coming and driven hard enough to justify the risk. It's the Bargain Window case study for engine snobs: nothing else gets you this specific V10 for this little money.