Mercedes-Benz M8
Registered from 2016 to 2019.
What fails its inspection
Great Britain's MOT record for the 2017 2.1 diesel. 33 of 129 tests failed, 26%.
Better than 1% of 2017 cars. The typical one fails 12%, across 926 models with enough tests behind them to say.
| Where | Share of failures | Failed tests |
|---|---|---|
| Suspension | 48% | 16 |
| Brakes | 45% | 15 |
| Exhaust and emissions | 18% | 6 |
| Lights and electrics | 15% | 5 |
| Tyres and wheels | 15% | 5 |
| Body and structure | 6% | 2 |
The defects inspectors cite
- A spring or spring component fractured or seriously weakened
- A suspension joint dust cover missing or no longer prevents the ingress of dirt etc
- A suspension pin, bush or joint excessively worn
- Significant brake effort recorded with no brake applied indicating a binding brake
- Engine MIL illuminated indicating a malfunction
- Parking brake efficiency below minimum requirement
Where it stands out against its peers
- Suspension: failed more often than 93% of 2017 cars — 48% of its 33 failed tests, where an ordinary 2017 car has 18%.
- Brakes: failed more often than 95% of 2017 cars — 45% of its 33 failed tests, where an ordinary 2017 car has 23%.
- Exhaust and emissions: failed more often than 90% of 2017 cars — 18% of its 33 failed tests, where an ordinary 2017 car has 7%.
Same model year only, at least 30 peer cars, zeros included. Every car has a worst part; this shows which, and how far from ordinary it is. A high share means more to check, not a verdict.
NHTSA's investigations are American; no European regulator publishes an equivalent record, so this section has nothing to draw on for a European car. There is no European equivalent of the service-bulletin register either.
Before you buy one
Built from what this car fails on, not from general knowledge of the model.
- Suspension — 48% of its failures
- A spring or spring component fractured or seriously weakened
- A suspension joint dust cover missing or no longer prevents the ingress of dirt etc
- A suspension pin, bush or joint excessively worn
- Brakes — 45% of its failures
- Significant brake effort recorded with no brake applied indicating a binding brake
- Parking brake efficiency below minimum requirement
- A brake lining or pad worn below 1.5mm
- Exhaust and emissions — 18% of its failures
- Tyres and wheels — 15% of its failures
- A tyre pressure monitoring system malfunctioning or obviously inoperative
- Lights and electrics — 15% of its failures
- Body and structure — 6% of its failures