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Bentley 4 door saloon 6cyl vs Bentley Unknown: reliability comparison

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

Bentley 4 door saloon 6cyl
83%
MOT pass rate · 1 vehicles
Bentley Unknown
90%
MOT pass rate · 9,548 vehicles
Verdict: On MOT pass rate the Bentley 4 door saloon 6cyl (83%) 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 4 door saloon 6cyl Bentley Unknown
MOT pass rate 83% 90% ✓
MOT failure rate 17% 10% ✓
Faults & advisories per test 1.3 0.9 ✓
Dangerous-fault share 0% ✓ 7%
Average mileage 83,707 mi 34,409 mi
Sample size (vehicles) 1 9,548

Most common faults

Bentley 4 door saloon 6cyl

  1. all 4 tyres perished
  2. Horn not working (1.6.2a)
  3. Windscreen washer provides insufficient washer liquid (8.2.3)
  4. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  5. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  6. all four tyres perished on sides

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 4 door saloon 6cyl (83%) and Bentley Unknown (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Bentley 4 door saloon 6cyl 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.