2020 Mercedes-Benz GLC 300 AMG Line 4MATIC Auto MOT pass rate: 93.7% (3,840 tests)
Is the 2020 GLC 300 AMG Line 4MATIC Auto getting worse?
Pass rate of 2020-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2023 | 94.8% +3.9 vs same-age |
|
| 2024 | 92.7% +2.7 vs same-age |
|
| 2025 | 93.5% +4.5 vs same-age |
The raw rate normally falls as cars age. The “vs same-age” figure compares this cohort with all UK cars registered in the same year, so normal ageing is not mistaken for a bad model year.
What fails on a 2020 GLC 300 AMG Line 4MATIC Auto
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Tyres | 210 | 60.2% |
| 2 | Brakes | 51 | 14.6% |
| 3 | Suspension | 22 | 6.3% |
| 4 | Visibility | 19 | 5.4% |
| 5 | Identification of the vehicle | 13 | 3.7% |
| 6 | Noise, emissions and leaks | 13 | 3.7% |
All GLC 300 AMG Line 4MATIC Auto years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2020 (this page) | 3,840 | 93.7% | +3.7 pts | 29,016 |
- Free MOT history checkThe exact car’s failures, advisories and mileage trail — sellers can’t edit it
- Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
- XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
- Autel UK testersAutel professional-grade diagnostic testers
FAQs
Is a 2020 Mercedes-Benz GLC 300 AMG Line 4MATIC Auto reliable?
2020-registered examples passed 93.7% of their MOT tests (3,840 tests, 2023–2025), +3.7 points versus all UK cars registered in the same year. At roughly 6 years old with a median 29,016 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2020 GLC 300 AMG Line 4MATIC Auto?
The median tested example shows 29,016 miles. Anything far beyond that isn't automatically bad — a motorway-mile car with consistent service records often beats a low-mileage school-run car — but price accordingly and scrutinise the mileage trail for gaps or drops.
Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (96 million Class 4 initial tests; retests excluded). Only vehicles old enough for a routine first MOT are included. Age-adjusted figures compare the model-year cohort with all vehicles of the same registration year tested in the same calendar year. Contains public sector information licensed under OGL v3.0.