Audi A6 vs Mercedes-Benz C400
Side-by-side comparison from manufacturer specifications, NHTSA safety data, and live dealer listings.
Vehicles
Vehicles
2015 Mercedes-Benz C400
Overview
| Spec | Audi A6Premium | Mercedes-Benz C400C 400 Sport 4MATIC |
|---|---|---|
| Selected trim | Premium | C 400 Sport 4MATIC |
| Body style | Sedan | Sedan |
| Drivetrain | all wheel drive | all wheel drive |
| Fuel type | premium unleaded (required) | premium unleaded (required) |
| Transmission | 7-speed automated manual | 7-speed shiftable automatic |
| Engine type | mild hybrid | gas |
| Model year | 2026 | 2015 |
Pricing & market
| Spec | Audi A6Premium | Mercedes-Benz C400C 400 Sport 4MATIC |
|---|---|---|
| MSRP | $64,100 | $48,590 (best) |
| Lowest listing price | $14,990 (best) | — |
| Median listing price | $23,396 (best) | — |
| Highest listing price | $24,999 (best) | — |
| For sale now | 4 (best) | 0 |
Fuel economy & range
| Spec | Audi A6Premium | Mercedes-Benz C400C 400 Sport 4MATIC |
|---|---|---|
| Combined MPG | 23 MPG | 24 MPG (best) |
| City MPG | 20 MPG | 21 MPG (best) |
| Highway MPG | 29 MPG | 29 MPG |
| Fuel tank | 19.3 gal (best) | 18 gal |
Performance
| Spec | Audi A6Premium | Mercedes-Benz C400C 400 Sport 4MATIC |
|---|---|---|
| Horsepower | 362 hp (best) | 329 hp |
| Torque | 406 lb-ft (best) | 354 lb-ft |
| Engine size | 3 L | 3 L |
| Cylinders | V6 | V6 |
Size & capability
| Spec | Audi A6Premium | Mercedes-Benz C400C 400 Sport 4MATIC |
|---|---|---|
| Seating | 5 seats | 5 seats |
| Doors | 4 | 4 |
| Cargo volume | 13.5 cu ft (best) | 12.6 cu ft |
| Curb weight | 4,310 lbs | 3,693 lbs (best) |
| Wheelbase | 115.1 in (best) | 111.8 in |
| Length | 196.8 in (best) | 184.5 in |
| Width | 73.8 in (best) | 71.3 in |
| Height | 57.4 in (best) | 56.8 in |
Safety & recalls
| Spec | Audi A6Premium | Mercedes-Benz C400C 400 Sport 4MATIC |
|---|---|---|
| NHTSA overall | Not Rated | — |
| Frontal crash (driver) | Not Rated | — |
| Frontal crash (passenger) | Not Rated | — |
| Side crash (driver) | Not Rated | — |
| Side crash (passenger) | Not Rated | — |
| Side pole | Not Rated | — |
| Rollover | Not Rated | — |
| Open recalls (YMM scope) | None reported (best) | 8 |
Highlighted values indicate the better figure for that spec when a clear winner exists. Specs reflect the selected trim for each vehicle. Drag a vehicle header to reorder columns. MSRP and specifications are manufacturer data; listing prices and inventory come from live dealer listings. Safety ratings are from NHTSA.
Trim overview
All available trims with MSRP. The trim selected above is highlighted; comparison specs use that selection.
| Trim | Audi A6 | Mercedes-Benz C400 |
|---|---|---|
| 1 | Premium $64,100 MSRP(Currently comparing) | C 400 Sport 4MATIC $48,590 MSRP(Currently comparing) |
| 2 | Premium Plus $67,500 MSRP | — |
| 3 | Prestige $71,400 MSRP | — |
Live inventory
Audi A64 for sale
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Used2017 Audi A6
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Used2021 Audi A6
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Used2019 Audi A6
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Used2019 Audi A6
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Mythos Black Metallic•Black58,124 mi$23,600LeithCars.com
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Audi A6 vs Mercedes-Benz C400 FAQ
- Which is better: 2026 Audi A6 or 2015 Mercedes-Benz C400?
- It depends on priorities. OpenDealer compares 2026 Audi A6 vs 2015 Mercedes-Benz C400 on MSRP, fuel economy, horsepower, seating, towing, NHTSA safety ratings, and live market prices so you can weigh the tradeoffs.
- Which costs less: 2026 Audi A6 or 2015 Mercedes-Benz C400?
- Based on starting MSRP, the 2015 Mercedes-Benz C400 starts lower at $48,590. Live Audi A6 listings start at $14,990.
- Which has better startingMsrp: 2026 Audi A6 or 2015 Mercedes-Benz C400?
- The 2015 Mercedes-Benz C400 leads on startingMsrp in this comparison (48,590).
- Which has better combinedMpg: 2026 Audi A6 or 2015 Mercedes-Benz C400?
- The 2015 Mercedes-Benz C400 leads on combinedMpg in this comparison (24).
- Which has better horsepower: 2026 Audi A6 or 2015 Mercedes-Benz C400?
- The 2026 Audi A6 leads on horsepower in this comparison (362).
- How do the NHTSA safety ratings compare for 2026 Audi A6 vs 2015 Mercedes-Benz C400?
- NHTSA overall crash-test ratings in this comparison: Audi A6 (Not Rated/5 NHTSA overall).