Audi A6 Allroad C5

Allroad in brief

The first A6 allroad quattro debuted in 2000 (C5 generation), followed by the C6 (2006–2011), C7 (2012–2018) and C8 (from 2019). All generations are based on the A6 Avant estate, but feature a higher ride height, plastic wheel arch and underbody protection, and standard quattro four-wheel drive.

In Lithuania, the allroad is seen as an alternative to an SUV: it's spacious, comfortable on long journeys, and sure-footed on gravel tracks and in winter. On the other hand, it's an expensive car to maintain — V6 engines, air suspension and complex electronics require specialist servicing.

C7 and C8 generations — how they differ

C5 and C6 generation cars are now quite old and fewer are on the market, so the two newest generations are the most relevant for most buyers.

C7 generation (2012–2018) is lighter and more modern than its predecessor, with a high-quality interior and a wide choice of 3.0 TDI engines. Late 2014 saw refreshed models with new headlights (often matrix LED) and more efficient engines.

From the C8 generation (2019 onwards), you get a digital cockpit with two touchscreens in the centre console and a virtual instrument cluster. V6 TDI engines come with a 48V mild hybrid system, and adaptive air suspension is standard.

Engines and gearboxes

The C7 generation mostly features the 3.0 TDI V6 diesel engine, ranging from around 190 to 272 hp. The most powerful is the 3.0 BiTDI with twin turbos (around 313–320 hp). The 3.0 TFSI petrol engine is rare. Most 3.0 TDI versions are paired with a 7-speed S tronic dual-clutch gearbox, while the BiTDI gets an 8-speed tiptronic automatic.

In the C8 generation, versions are denoted by power: 45 TDI (around 231 hp), 50 TDI (around 286 hp) and 55 TDI (around 349 hp) — all with the 3.0 V6 diesel engine and 8-speed tiptronic automatic gearbox. Later, some markets saw the introduction of the 2.0 TDI (40 TDI) version, while petrol cars are very scarce.

All versions come with quattro four-wheel drive. Newer diesel engines use AdBlue fluid.

What to check when buying a used A6 allroad

Air suspension is the most common expensive repair: check if the car doesn't sag after overnight parking, if the compressor doesn't run too long, and if there are no suspension faults on the instrument cluster. Also, test the height modes via Audi drive select.

The 3.0 TDI V6 engine's timing chain is at the rear of the engine, so replacing it is expensive — the cold engine shouldn't rattle after starting. In a C7 with an S tronic gearbox, movement from a standstill should be smooth, without judders or hesitation; ask if the gearbox oil has been changed. Check the diesel particulate filter (DPF), EGR valve, and AdBlue system.

In a C8, test the touchscreens and driver assistance systems, and the diagnostics should show if there are any 48V system faults. Many allroads are imported, so check the service history and MOT records for any issues.

Versions

The A6 allroad is often sold as a well-equipped version that differs by engine and chosen option packs; in some markets, there were additional trim names.

Comparing the versions

Many buyers' top pick is the C8 generation 45 TDI: modern, adequately powerful, and more frugal. The C7 is worth considering for its lower price, but only with a checked suspension and clear service history.

Frequently asked questions