Mercedes-benz E vs Mercedes-benz Sl400: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Mercedes-benz E
79%
MOT pass rate · 429,719 vehicles
Mercedes-benz Sl400
90%
MOT pass rate · 3 vehicles
Verdict: On MOT pass rate the Mercedes-benz E (79%) and Mercedes-benz Sl400 (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Mercedes-benz E | Mercedes-benz Sl400 |
|---|---|---|
| MOT pass rate | 79% | 90% ✓ |
| MOT failure rate | 21% | 10% ✓ |
| Faults & advisories per test | 1.6 ✓ | 1.9 |
| Dangerous-fault share | 3% | 0% ✓ |
| Average mileage | 124,278 mi | 46,365 mi |
| Sample size (vehicles) | 429,719 | 3 |
Most common faults
Mercedes-benz E
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
Mercedes-benz Sl400
- covers fitted obscuring some components in the engine bay
- under-trays fitted obscuring some underside components
- Nearside Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Nearside Front Lower Suspension arm ball joint has slight play (5.3.4 (a) (i))
- Nearside Rear Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Offside Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
Reliability FAQ
On MOT pass rate the Mercedes-benz E (79%) and Mercedes-benz Sl400 (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Mercedes-benz E report Full Mercedes-benz Sl400 report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.