Audi S6 Saloon.
What to Check Before Buying.

The Audi S6 Saloon is a high-performance executive car that blends everyday usability with serious pace, typically appealing to buyers who want Q-car discretion with a twin-turbo V6 or V8 under the bonnet. Most examples have covered motorway miles and come with comprehensive service histories, but the complexity of these cars means maintenance costs can be substantial if you buy the wrong one. Suspension components, turbocharger health, and electronic system integrity are the key areas to scrutinise before committing to a purchase.

The average used car has 3+ known model faults the seller won't mention.