Bentley 3 litre speed vs Bentley Unknown: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Bentley 3 litre speed
100%
MOT pass rate · 1 vehicles
Bentley Unknown
90%
MOT pass rate · 9,548 vehicles
Verdict: On MOT pass rate the Bentley 3 litre speed (100%) and Bentley Unknown (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Bentley 3 litre speed | Bentley Unknown |
|---|---|---|
| MOT pass rate | 100% ✓ | 90% |
| MOT failure rate | 0% ✓ | 10% |
| Faults & advisories per test | 0.0 ✓ | 0.9 |
| Dangerous-fault share | — ✓ | 7% |
| Average mileage | 1 mi | 34,409 mi |
| Sample size (vehicles) | 1 | 9,548 |
Most common faults
Bentley 3 litre speed
No fault breakdown available.
Bentley Unknown
- COVID-19 6 MONTH EXTENSION
- Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))
- Parking brake: efficiency below requirements (3.7.B.7)
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Oil leak
- Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate the Bentley 3 litre speed (100%) and Bentley Unknown (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Bentley 3 litre speed report Full Bentley Unknown 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.