Audi A6 — Six Generations of Audi's Executive Car

Audi A6 at a glance

All Audi models in the catalogue are listed on the Audi brand page. The sporty versions have their own article: Audi S6 specifications and history.

C4 (1994–1997): from Audi 100 to A6

The first A6 was a facelifted Audi 100 of the C4 series. Audi sold 3.2 million cars under the Audi 100 name, and in 1994 the model took on the new name. The C4 was offered as a saloon and an Avant, built at Neckarsulm, with a wheelbase of 2,692 mm in the all-wheel-drive version. Engines ranged from the 1.9 TDI with 66 kW (90 PS) and the 2.5 TDI with 103 kW (140 PS) to petrol units of 1.8 to 2.8 litres; the 2.8 V6 had 142 kW (193 PS).

The S6 used either a 2.2-litre turbocharged five-cylinder with 169 kW (230 PS) and 350 Nm or a 4.2-litre V8 with 213 kW (290 PS). The rarest version was the S6 Plus, built from June 1996 to October 1997 with 240 kW (326 PS): only 952 were made, 855 of them Avants.

C5 (1997–2005): the allroad and the first RS6

The C5 (Typ 4B) was introduced in February 1997; the saloon reached European customers in mid-1997 and the Avant in 1998. A new body style followed in 1999: the allroad quattro, derived from the Avant and built until July 2005. A long-wheelbase saloon was made for China. Car and Driver named the A6 one of its Ten Best cars in 2000 and 2001.

The engine range was wide. The 1.8T had 110 or 132 kW, the 2.7T V6 between 169 and 195 kW, and the 4.2 V8 221 kW (300 PS). Diesels were the 1.9 TDI with 81 kW and the 2.5 TDI with up to 132 kW (180 PS) and 370 Nm. The S6 had 250 kW (340 PS); the first RS6 had 331 kW (450 PS) and 560 Nm, and the RS6 plus 353 kW (480 PS). A facelift followed in May 2001.

C6 (2004–2011): V10 engines and a World Car of the Year

The C6 (Typ 4F) went on sale in spring 2004; the Avant arrived during 2005 and an allroad quattro in 2006. It was developed from the C5 but lengthened, to 4,927 mm. The updated A6 was named World Car of the Year for 2005. Petrol engines included the 2.0 TFSI with 125 kW and 280 Nm, the 3.2 FSI V6 with 188 kW (255 PS) and the supercharged 3.0 TFSI with 213 kW (290 PS), later 221 kW (300 PS). Diesels ran from the 2.0 TDI (103 kW) to the 3.0 TDI with up to 176 kW (239 PS).

At the top, the S6 used a 5.2-litre V10 with 320 kW (435 PS) and 540 Nm, and the RS6 of the facelifted range a twin-turbo 5.0-litre V10 with 426 kW (579 PS) and 650 Nm. The facelift came in autumn 2008. Besides Neckarsulm, the C6 was assembled in India and China.

C7 (2011–2018): MLB platform, hybrid and BiTDI

The C7 (Typ 4G) was presented on 1 December 2010; the saloon went on sale in April 2011 and the Avant in September. It moved to the MLB platform shared with the A7, with a wheelbase about 76 mm longer than before and a drag coefficient of 0.25. The allroad followed in 2012 and the facelift in October 2014. Production ended in May 2018.

The petrol range included the 2.0 TFSI (132 or 155 kW) and the supercharged 3.0 TFSI with 221 kW, from 2012 228 kW (310 PS). Diesels went from the 2.0 TDI with 130 kW, later the 2.0 TDI ultra with 140 kW and 400 Nm, to the 3.0 BiTDI with 230 kW (313 PS) and 650 Nm. The A6 hybrid combined the 2.0 TFSI with a 33 kW electric motor; Wikipedia counts about 4,000 sold before it was dropped in 2014. The S6 had a twin-turbo 4.0 TFSI V8 with 309 kW (420 PS), the RS6 a twin-turbo 4.0 TFSI V8 with 412 kW (560 PS) and 700 Nm.

C8 (2018–2025): mild hybrids for every engine

The C8 (Typ 4K) saloon was presented on 28 February 2018 and shown in Geneva in March; the Avant followed in April, and sales started in June 2018. Every engine received mild-hybrid technology as standard. Typical versions were the 45 TFSI quattro with 180 kW (245 PS), 370 Nm and 6.0 seconds from 0 to 100 km/h, and the 50 and 55 TFSI e plug-in hybrids. The allroad arrived in Europe in June 2019.

The S6 used a 2.9 TFSI V6 in some markets and a V6 TDI in Europe. The RS6 Avant of 2019 had a 4.0-litre V8 with 441 kW (600 PS) and 800 Nm and reached 305 km/h with the Dynamic Plus package; the later RS6 Avant performance raised that to 463 kW (630 PS). Euro NCAP gave the C8 five stars in 2018. A facelift came in 2023, and ADAC lists the C8 until 2025.

C9 (since 2025): the A6 keeps its name

In 2023 Audi announced that combustion models would take odd numbers and electric models even numbers, which would have turned the new A6 into an A7. The plan was not carried out: the new Avant has been on sale in Europe since 16 May 2025 as the A6, and the saloon followed at the end of July. The battery-electric car of the same size is the A6 e-tron.

All three engines use the 48-volt "MHEV plus" system. Audi quotes 5.0–8.0 l/100 km for the Avant and 4.8–7.8 l/100 km for the saloon. The Avant measures 5.00 × 1.90 × 1.47 m and carries 503 litres, or 1,534 litres with the rear seats folded; the 4.99 m saloon has a 492-litre boot. In Germany the saloon started at €55,500 with the 2.0 TFSI, €59,200 with the TDI quattro and €70,000 with the 3.0 TFSI quattro (April 2025). A five-metre car does not fit every garage — the will it fit in my garage tool checks that in a minute.

Engines by generation

Every version in the catalogue can be compared with its rivals in the car comparison tool.

Reliability, safety and running costs

The ADAC breakdown statistics show a weak spot in the C8's early years: 16.6 breakdowns per 1,000 cars for 2019 registrations and 11.6 for 2020, against 1.1 for 2023 registrations. ADAC names the alternator as a recorded cause of breakdowns on cars from 2018 to 2020, so a used C8 from those years should have proof that this has been checked or replaced. Later C8s and the C9 have the lowest rates.

On safety, Euro NCAP awarded the C8 five stars in 2018. Running costs depend heavily on the engine: a four-cylinder TDI and a V8 RS6 belong to very different budgets, which the cost of ownership calculator helps to compare.

Which A6 to choose

For a new car, the C9 Avant 2.0 TDI is the most practical all-rounder: 400 Nm, front- or all-wheel drive and a large boot. The 3.0 TFSI quattro suits drivers who want six-cylinder performance. On the used market a C8 from 2021 onwards avoids the years with the highest ADAC breakdown rates; the 45 TFSI quattro and the diesels are the sensible versions, and the 50 or 55 TFSI e plug-in hybrids make sense for drivers who can charge at home.

Older cars are a matter of taste and budget: a C7 3.0 TDI is a comfortable long-distance car, and the C6 or C5 allroad remain interesting for rough roads. The BMW 5 Series and the Mercedes-Benz E-Class are the classic rivals; the Jaguar XF is compared with the A6 in Jaguar XF or Audi A6, and the larger SUV alternative is the Audi Q7.

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