2018 Mercedes-Benz X MOT pass rate: 82.2% (3,798 tests)
Is the 2018 X getting worse?
Pass rate of 2018-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2023 | 81.6% -6.5 vs same-age |
|
| 2024 | 81.8% -4.5 vs same-age |
|
| 2025 | 83.2% -1.5 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 2018 X
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Brakes | 353 | 25.4% |
| 2 | Lamps, reflectors and electrical equipment | 211 | 15.2% |
| 3 | Noise, emissions and leaks | 206 | 14.8% |
| 4 | Tyres | 201 | 14.5% |
| 5 | Seat belts and supplementary restraint systems | 117 | 8.4% |
| 6 | Visibility | 113 | 8.1% |
All X years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2018 (this page) | 3,798 | 82.2% | -4.2 pts | 62,992 |
| 2019 | 4,772 | 83.7% | -4.7 pts | 52,818 |
| 2020 | 1,905 | 86.2% | -3.6 pts | 42,346 |
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FAQs
Is a 2018 Mercedes-Benz X reliable?
2018-registered examples passed 82.2% of their MOT tests (3,798 tests, 2023–2025), -4.2 points versus all UK cars registered in the same year. At roughly 8 years old with a median 62,992 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2018 X?
The median tested example shows 62,992 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.