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Bentley Three litre vs Bentley Unknown: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Bentley Three litre
88%
MOT pass rate · 3 vehicles
Bentley Unknown
90%
MOT pass rate · 9,548 vehicles
Verdict: On MOT pass rate the Bentley Three litre (88%) 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 Three litre Bentley Unknown
MOT pass rate 88% 90% ✓
MOT failure rate 12% 10% ✓
Faults & advisories per test 1.3 0.9 ✓
Dangerous-fault share 0% ✓ 7%
Average mileage 18,669 mi 34,409 mi
Sample size (vehicles) 3 9,548

Most common faults

Bentley Three litre

  1. Nearside Front Steering pivot point has slight play (2.2.B.1g)
  2. Offside Front Steering pivot point has slight play (2.2.B.1g)
  3. Nearside Rear Wheel fitment has slight wear between wheel and hub spigot mounting (4.2.B.5)
  4. Offside Rear Tyre worn close to the legal limit (4.1.E.2b)
  5. Body insecure and dangerous to other road users (6.1.B.1b)
  6. Front suspension locking device missing (2.5.A.4)

Bentley Unknown

  1. COVID-19 6 MONTH EXTENSION
  2. Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))
  3. Parking brake: efficiency below requirements (3.7.B.7)
  4. Windscreen washer provides insufficient washer liquid (8.2.3)
  5. Oil leak
  6. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate the Bentley Three litre (88%) and Bentley Unknown (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Bentley Three litre 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.