Audi allroad quattro (C5)
Why 8.2: An A6 Avant on four-level air suspension with 208 mm of ground clearance at its highest setting, wrapped in unpainted cladding, with the 2.7-litre biturbo V6 the B5 S4 also used, here at 250 hp, and — uniquely for the genre — the option of a six-speed manual. It did more than anything else to make the raised estate a category.
Layout
Natural habitat
Ride comfort
Sound
The 2.7 biturbo spools with a soft whistle and there is a faint six-cylinder hum underneath at part throttle. But Audi built this as a comfortable estate and insulated it to match, and the small turbos flatten anything happening near the 6,500 rpm limit.
6-cylinder · turbocharged · 6,500 rpm redline · rated 4.8 / 10 for engine sound
Market value
Median asking price, good condition · €39k (2001) → €8k (2026), trending down · illustrative data
Child seats · ISOFIX
ISOFIX was spreading through these years rather than fitted across the board — whether a given car has rear anchors depends on its year and market.
Children were expected in the back. Front-passenger ISOFIX effectively didn't exist in this era, and airbag deactivation was patchy — treat the front seat as a no unless a specific car proves otherwise.
Derived from production years and seating layout, not a per-car source. ISOFIX was standardised as ISO 13216 in 1997, required on new EU model types from 2011 and on all new EU cars from 2014.
The long version
The C5 allroad was Audi's answer to a question nobody in Ingolstadt had asked out loud: what does a quattro estate need to become an alternative to an SUV rather than a compromise against one. The answer was air, and it worked — the suspension drops the car to normal Avant height at motorway speed and lifts it to 208 mm on a farm track, which covers almost every real use anyone has for a soft-roader. It also aged into one of the great cautionary tales of German engineering, because air springs perish, the compressor burns out, the 2.7-litre biturbo needs its timing belt at intervals nobody enjoys paying for, and the whole assembly does this at a point in the depreciation curve where the repair costs more than the car. What that produced is one of the most self-selecting owner bodies on this index. An allroad has been a four-figure car for fifteen years, so the only people who own one are people prepared to do the work — or to fit the coilover conversion kit that an entire aftermarket exists to sell them — and having done it, they drive the thing, because there is no resale value to protect and no audience to impress. The manual 2.7T is the version enthusiasts chase and even that has barely moved in price. Very high miles, essentially zero flipping, and a car that survives on the stubbornness of its owners.