Audi A6 C8 vs Mercedes-Benz C-Class W205
Audi A6
C8 · 2018 – 2025
The fifth-generation A6 (C8), on MLB Evo.
Mercedes-Benz C-Class
W205 · 2014 – 2021
The fourth-generation C-Class (W205), on the MRA rear-wheel-drive platform.
Audi A6
Pick the C8 for the 55 TFSI e plug-in hybrid and quattro — ideally a car with the MIB3 software updates applied.
Mercedes-Benz C-Class
Pick the C-Class for an S-Class-inspired interior, a hushed ride and efficient engines in a premium compact executive sedan.
Performance
EA888 45 TFSI · Petrol vs M274 C 200 · Petrol
| Audi A6 | Mercedes-Benz C-Class | |
|---|---|---|
| Power |
245 hp
Winner
|
184 hp
|
| Torque |
370 Nm
Winner
|
300 Nm
|
| 0–100 km/h |
6,0 s
Winner
|
7,2 s
|
| Top speed |
250 km/h
Winner
|
237 km/h
|
| Power-to-weight |
148,5 hp/t
Winner
|
125,2 hp/t
|
| CO₂ emissions (WLTP) |
160 g/km
|
131 g/km
Winner
|
| Consumption (WLTP) |
7,1 L/100km
|
5,8 L/100km
Winner
|
Dimensions & space
| Audi A6 | Mercedes-Benz C-Class | |
|---|---|---|
| Boot |
530 L
Winner
|
480 L
|
| Boot (seats folded) |
—
|
—
|
| Wheelbase |
2,92 m
Winner
|
2,84 m
|
| Length |
4,94 m
|
4,69 m
|
| Ground clearance |
12,0 cm
|
13,0 cm
|
| Turning circle |
12,2 m
|
11,2 m
Winner
|
| Towing capacity (braked) |
2.000 kg
Winner
|
1.800 kg
|
Powertrain & tech
| Audi A6 | Mercedes-Benz C-Class | |
|---|---|---|
| Platform | MLB Evo (longitudinal) | MRA (rear-wheel-drive base) |
| Drive | Front-wheel drive · All-wheel drive | Rear-wheel drive · All-wheel drive |
| Engine family | EA888 2.0 TFSI · EA839 3.0 TFSI · EA288 2.0 TDI · 55 TFSI e PHEV | M274 2.0 petrol · OM651 2.1 / OM654 2.0 diesel · C 300 e PHEV |
| Transmission | 7-speed S tronic | 9G-Tronic (9-speed) |
| Fuel | Petrol | Petrol |
| Euro standard | Euro 6d-TEMP | Euro 6 |
| LEZ access | Unrestricted access (compliant under current legislation) | Unrestricted access (compliant under current legislation) |
Reliability & watch-outs
Known issues
- 48V mild-hybrid (BSG): belt-starter-generator needs checking on early cars
- MMI touch (MIB3): software bugs and reboots on early C8 cars
- AdBlue/SCR on 2.0 TDI diesels with mainly short trips
- Timing chain on early OM651 diesels
- 9G-Tronic service
- AdBlue (OM654) / Airmatic air suspension
Pros
- Dual-screen MMI touch cockpit
- 55 TFSI e plug-in hybrid does ~50 km electric
- 3.0 TFSI (55) has 340 hp
- S-Class-inspired interior
- Quiet, refined ride (Airmatic)
- Efficient OM654 diesel (post-facelift)
Cons
- 55 TFSI e plug-in hybrid cuts saloon boot space down to 360 litres
- Gloss-black interior plastics and dual touchscreens show fingerprints easily
- Firm ride on AMG Line
- Dated pre-facelift infotainment
Driving experience
Audi A6
Comfortable, quiet and genuinely refined. The A6 rides with excellent isolation, steers accurately with light weighting, and cruises with the calm composure expected of a large executive saloon. Front-drive versions are efficient; quattro adds traction and security. The 2.0 TFSI is smooth, the 3.0 TDI V6 is the long-distance workhorse, and the 55 TFSI e plug-in covers short trips on electric power. The S tronic is quick, the tiptronic smooth. It is a tech-heavy, comfort-first executive car that does long distances with little effort.
Mercedes-Benz C-Class
The W205 leans fully into the Mercedes comfort remit: it wafts rather than corners hard. The ride is plush, the cabin library-quiet at speed, and the 9G-Tronic dissolves shifts so completely you forget it is there. The steering is relaxed and low-effort, matching the unhurried character. Engines matter more than chassis here: the M274/M264 petrols are smooth and unobtrusive, the OM654 diesel is the one to have, and the plug-in covers town trips almost entirely on battery. AIRMATIC, where fitted, turns poor roads into a distant murmur. It does not ask to be driven hard — it makes every journey feel shorter than it was.
Belgian taxes & LEZ
For sale at dealers
Audi A6
30 for sale · from € 7.990
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Mercedes-Benz C-Class
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