Cross-brand
Mercedes C-Class vs Audi A4
Used compact executive comparison covering diesel and petrol choices, automatic gearboxes, cabin quality, emissions systems, and repair risk.
Mercedes-Benz C-Class
70
/ 100
Audi A4
68
/ 100
Best used buy
Mercedes-Benz C-Class
C-Class for comfort with strong Mercedes history; A4 when quattro or Avant practicality matters and S tronic service is proven.
There is no safe badge shortcut here. The C-Class narrowly wins for comfort and specialist support, while a well-kept A4 Avant can be the more useful ownership tool.
Key differences
- C-Class is comfort-led and commonly rear-wheel drive.
- A4 offers Avant practicality and available quattro.
- Mercedes 9G-Tronic and Audi S tronic require different inspection logic.
- Both can carry expensive diesel emissions hardware.
Buyer advice
- Choose body style and drivetrain for real use.
- Check cold-start, gearbox, and emissions behavior on one long drive.
- Read invoices for actual fluid specifications and completed repairs.
Red flags
- S tronic judder
- 9G-Tronic flare
- Oil consumption
- AdBlue warnings
- Suspension knocks