2018 Mercedes-Benz S-Class · 10,910 MOT tests
2018 Mercedes-Benz S-Class reliability
2018 Mercedes-Benz S-Classs fail 7.4% of first MOT tests, 60% fewer MOT fails than the average car its age and mileage, ranking 1 of 21 S-Class years (10,910 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Mercedes-Benz S-Classs: 15.8%)
- 7.4%
- first-time fail rate (all Mercedes-Benz S-Classs: 15.8%)
- fails than cars of the same age and mileage
- 60% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 5
- 55,371
- typical miles at its MOT, aged about 5
- MOT tests, 2022 to 2024
- 10,910
- MOT tests, 2022 to 2024
Year on year
2018 against the years either side
- 2017 cars: 48% fewer MOT fails than the average car its age (the 2018 car does better)
- 2019 cars: 59% fewer MOT fails than the average car its age (the 2018 car does better)
- Strong point: suspension, 61% 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 S-Class
Fail rate by area
- Tyres3.4%
- Suspension1.1%
- Lights and electrics0.7%
- Exhaust, emissions and leaks0.7%
- Brakes0.7%
- Windscreen, wipers and mirrors0.7%
- Wheels0.6%
Average for cars of the same age and mileage
Top failures
Tyre tread below 1.6mm 1.01%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Suspension ball joint excessively worn 0.72%
A worn ball joint can fail and cause loss of steering control, so it must be replaced promptly.
Tyre cut reaching ply or cords 0.66%
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 0.63%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
Tyre bulge from structural failure 0.42%
A bulge means the tyre's structure has failed and it could burst suddenly, so it must be replaced at once.
Number plate does not meet standards 0.35%
The plate does not meet legal specifications, so it must be replaced with a compliant one before the car is driven.
Common advisories
Tyre worn close to legal limit (7.42%) · Brake pads wearing thin (3.17%) · Brake disc pitted or scored (1.81%) · Suspension ball joint slight play (1.62%) · Brake discs showing some wear (1.49%) · Tyre worn close to legal limit (1.3%)
Other years
Every Mercedes-Benz S-Class year
The full picture: Mercedes-Benz S-Class reliability. Before you pay for any Mercedes-Benz S-Class, a Full Check (£9.99) shows finance, stolen and write-off records the MOT can't.
Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 2018 Mercedes-Benz S-Class reliable?
2018 Mercedes-Benz S-Classs fail 7.4% of first MOT tests, 60% fewer MOT fails than the average car its age and mileage, ranking 1 of 21 S-Class years (10,910 DVSA tests, 2022 to 2024).
What fails on a 2018 Mercedes-Benz S-Class MOT?
Most often tyre tread below 1.6mm (1.01% of tests), suspension ball joint excessively worn (0.72% of tests), tyre cut reaching ply or cords (0.66% of tests).
How many miles should a 2018 Mercedes-Benz S-Class have done?
At its MOT aged about 5, a typical 2018 Mercedes-Benz S-Class shows 55,371 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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