Used buying guide · 2025 DVSA data
Buying a used Mercedes-Benz GLS
The Mercedes-Benz GLS passed 87.83% of its 1,874 initial MOT tests in 2025 — better than the 77.3% average for all cars. That tells you about the model. It tells you nothing about the specific car you are looking at, which is where the expensive surprises live.
Checking a specific Mercedes-Benz GLS?
Enter its registration to see finance, write-off, stolen, mileage and keeper history before you commit.
What the MOT data shows about the Mercedes-Benz GLS
Ranked on pass rate, the Mercedes-Benz GLS sits 155 of 651 models in this data. Mercedes-Benz as a marque averaged 80.28%, so this model runs 7.6 points ahead of its own brand. A pass rate is not a reliability score — it records whether cars met the roadworthiness standard on test day.
How age affects a used Mercedes-Benz GLS
This matters more than the headline figure when you are buying: it shows what happens to this model as it gets older.
| Age at test | Tests | Pass rate |
|---|---|---|
| 3–5 years | 4 | 75% |
| 6–10 years | 1,867 | 87.84% |
| 11 years and over | 1 | 100% |
Older Mercedes-Benz GLS examples test at least as well as newer ones here, which usually says more about how they are kept than about the age itself.
What a Mercedes-Benz GLS most often fails on
Across every Mercedes-Benz GLS that failed its 2025 MOT, these are the areas testers recorded most often. Treat it as a list of what to look at on a viewing, not as a fault list for any particular car.
| Failure area | Share of failure items |
|---|---|
| Tyres | 58.58% |
| Brakes | 9.57% |
| Body, chassis, structure | 5.61% |
| Suspension | 4.95% |
| Lamps, reflectors and electrical equipment | 4.95% |
| Identification of the vehicle | 4.62% |
See the specific defects Mercedes-Benz GLS cars fail on, or the full Mercedes-Benz GLS MOT pass rate breakdown.
What the MOT record will not tell you
Knowing that Mercedes-Benz GLS failures cluster around tyres and brakes tells you what to inspect. It tells you nothing about whether the car is legally safe to buy. An MOT records that a car met a minimum standard on the day it was tested. It does not check the engine, clutch or gearbox, and it says nothing at all about the car's legal and financial history. On a 7.5-year-old average example those are the risks that cost real money:
- Outstanding finance. If money is still owed against the car, the lender may retain an interest in it after you have paid the seller.
- Insurance write-off history. A recorded Cat S or Cat N marker is permanent and affects safety, insurance and resale — and it does not appear on the V5C.
- Stolen markers. A vehicle recorded as stolen can be seized even from a buyer who bought it in good faith.
- Mileage history. Recorded readings that do not move consistently between tests are the clearest sign of a clocked car.
- Previous keepers. An unusual number of owners for the age of the car is worth asking about.
A Carpeep car history check reports all of those against the registration, plus tax status, import and export markers, scrapped status and the vehicle identity details, in one £15 report.
Check the Mercedes-Benz GLS you are looking at
One registration, one report. Finance, write-off, stolen, mileage, keepers, MOT and tax.
Other Mercedes-Benz models
- Used Mercedes-Benz A-Class 77.86% MOT pass rate
- Used Mercedes-Benz GLA 85.48% MOT pass rate
- Used Mercedes-Benz Vito 73.61% MOT pass rate
- Used Mercedes-Benz GLC 88.01% MOT pass rate
- Used Mercedes-Benz CLA 83.53% MOT pass rate
- Used Mercedes-Benz B-Class 74.91% MOT pass rate
Used Mercedes-Benz GLS FAQs
What should I check before buying a used Mercedes-Benz GLS?
Check the individual car rather than the model: outstanding finance, insurance write-off records, stolen markers, mileage history and the number of previous keepers. None of these appear on the V5C or in the MOT record, and a seller does not have to volunteer them. On the model itself, DVSA data for 2025 shows the Mercedes-Benz GLS passed 87.83% of its initial MOT tests.
Is the Mercedes-Benz GLS reliable?
MOT data does not measure reliability, it measures whether a car met the roadworthiness standard on the day of its test. What it does show for the Mercedes-Benz GLS is a 87.83% first-time pass rate across 1,874 tests in 2025, which is better than the 77.3% average for all cars.
How do I check a Mercedes-Benz GLS's history?
Enter the registration of the specific car. A Carpeep car history check reports outstanding finance, write-off category, stolen markers, mileage history, previous keepers, MOT and tax status, import and export markers and scrapped status in one £15 report.
What does a Mercedes-Benz GLS usually fail its MOT on?
Across Mercedes-Benz GLS cars that failed their 2025 MOT, the most commonly recorded failure area was tyres, accounting for 58.58% of failure items. This reflects what testers recorded, not a fault specific to any one car.
MOT figures aggregated from the DVSA MOT Anonymised data set for 2025 (class 4 initial tests, retests excluded), licensed under the Open Government Licence v3.0. MOT results describe roadworthiness at test, not mechanical reliability.