2018 Mercedes-Benz GLS · 2,044 MOT tests
2018 Mercedes-Benz GLS reliability
2018 Mercedes-Benz GLSs fail 11.9% of first MOT tests, 26% fewer MOT fails than the average car its age and mileage, ranking 4 of 5 GLS years (2,044 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Mercedes-Benz GLSs: 11.1%)
- 11.9%
- first-time fail rate (all Mercedes-Benz GLSs: 11.1%)
- fails than cars of the same age and mileage
- 26% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 5
- 42,918
- typical miles at its MOT, aged about 5
- MOT tests, 2022 to 2024
- 2,044
- MOT tests, 2022 to 2024
Year on year
2018 against the years either side
- 2017 cars: 40% fewer MOT fails than the average car its age (the 2018 car does worse)
- 2019 cars: 45% fewer MOT fails than the average car its age (the 2018 car does worse)
- Weak spot: body, chassis and structure, 1.4% of tests fail here (115% above cars of the same age and mileage).
- Strong point: lights and electrics, 70% fewer fails than comparable cars.
- Plates: a 2018 car carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
Common problems
What fails on a 2018 Mercedes-Benz GLS
Fail rate by area
- Tyres6.3%
- Brakes1.9%
- Body, chassis and structure1.4%
- Lights and electrics1.2%
- Number plates and VIN0.8%
- Windscreen, wipers and mirrors0.8%
- Exhaust, emissions and leaks0.7%
Average for cars of the same age and mileage
Top failures
Tyre tread below 1.6mm 2.01%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Tyre cut reaching ply or cords 1.76%
A cut reaching the ply or cords weakens the tyre and can cause a burst, so it must be replaced.
Tyre ply or cords exposed 1.32%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
CV joint boot split or insecure 0.68%
A split CV boot lets dirt in and grease out, so the joint wears and may need full replacement.
Brake pads worn to wear indicator 0.64%
Pads worn to the indicator are at their limit, reducing braking and needing immediate replacement.
Brake pads worn below 1.5mm 0.64%
Pads worn below 1.5mm lose stopping power and can damage discs, so replacement is needed before the car is driven.
Common advisories
Tyre worn close to legal limit (10.96%) · Brake pads wearing thin (5.09%) · Brake disc pitted or scored (2.2%) · Brake discs showing some wear (2.05%) · Nail in tyre, monitor (1.96%) · Child seat limits belt inspection (1.81%)
Other years
Every Mercedes-Benz GLS year
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Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 2018 Mercedes-Benz GLS reliable?
2018 Mercedes-Benz GLSs fail 11.9% of first MOT tests, 26% fewer MOT fails than the average car its age and mileage, ranking 4 of 5 GLS years (2,044 DVSA tests, 2022 to 2024).
What fails on a 2018 Mercedes-Benz GLS MOT?
Most often tyre tread below 1.6mm (2.01% of tests), tyre cut reaching ply or cords (1.76% of tests), tyre ply or cords exposed (1.32% of tests).
How many miles should a 2018 Mercedes-Benz GLS have done?
At its MOT aged about 5, a typical 2018 Mercedes-Benz GLS shows 42,918 miles. Much higher or lower is worth asking about.
What plate is a 2018 car?
A car first registered in 2018 carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
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