2018 Mercedes-Benz Gls MOT pass rate: 87.8% (1,693 tests)
Is the 2018 Gls getting worse?
Pass rate of 2018-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2023 | 89.3% +1.3 vs same-age |
|
| 2024 | 86.8% +0.5 vs same-age |
|
| 2025 | 87.1% +2.4 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 Gls
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Tyres | 191 | 50.8% |
| 2 | Brakes | 84 | 22.3% |
| 3 | Body, chassis, structure | 27 | 7.2% |
| 4 | Identification of the vehicle | 25 | 6.6% |
| 5 | Noise, emissions and leaks | 15 | 4.0% |
| 6 | Suspension | 11 | 2.9% |
All Gls years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2017 | 1,872 | 90.0% | +6.0 pts | 62,036 |
| 2018 (this page) | 1,693 | 87.8% | +1.4 pts | 51,517 |
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FAQs
Is a 2018 Mercedes-Benz Gls reliable?
2018-registered examples passed 87.8% of their MOT tests (1,693 tests, 2023–2025), +1.4 points versus all UK cars registered in the same year. At roughly 8 years old with a median 51,517 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2018 Gls?
The median tested example shows 51,517 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.