2020 Mercedes-Benz C-Class Pre-Purchase Inspection Checklist
Known Issues — 2020 Mercedes-Benz C-Class
MODERATE
Oil consumption in 2.0L turbo — requires topping off between services
MODERATE
9G-Tronic transmission clunky engagement at low speeds
MODERATE
C63 AMG oil leaks from valve cover and cam tower gaskets
MODERATE
Sunroof drain tube clogging leading to interior water damage
MINOR
Parking sensor module failures
MODERATE
Suspension clunking noise from front strut mounts
What to Inspect
- Check for oil leaks under hood — especially valve cover areas on AMG
- Verify transmission smooth engagement from stop and in traffic
- Inspect front strut mounts for clunking over bumps
- Check sunroof drainage and headliner condition
- Test all parking sensors front and rear
- Pull full diagnostic scan for pending and stored codes
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Service A (oil & filter) | every 10,000 miles | $280-$400 |
| Service B (full inspection) | every 20,000 miles | $550-$800 |
| Spark plugs replacement | every 60,000 miles | $300-$500 |
| Transmission fluid service | every 40,000 miles | $350-$500 |
| Brake pads and rotors (front) | every 25,000-35,000 miles | $700-$1,100 |
| Strut mount replacement (pair) | as needed | $400-$650 |
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