MOT performance
Mercedes-Benz SL vs Bentley Continental: MOT pass rates compared
In 2023–2024, 82.9% of 43,454 Mercedes-Benz SL MOT tests and 91.1% of 29,070 Bentley Continental tests passed first time — 8.1 points in favour of the Bentley Continental. Once age, mileage and fuel are allowed for, the Bentley Continental fails less often than the Mercedes-Benz SL: 0.34× against 0.54× the national rate for comparable cars.
43,454 Mercedes-Benz SL and 29,070 Bentley Continental MOT tests, 2023–2024
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| Figure | Value | Basis |
|---|---|---|
| Mercedes-Benz SL: first-time pass rate | 82.9% | ±0.4 pts (95%), n = 43,454 |
| Bentley Continental: first-time pass rate | 91.1% | ±0.3 pts (95%), n = 29,070 |
| Mercedes-Benz SL: failures vs similar cars | -46% | same age, mileage and fuel = 1.00 |
| Bentley Continental: failures vs similar cars | -66% | same age, mileage and fuel = 1.00 |
| Mercedes-Benz SL: dangerous defect | 4.4% | n = 43,454 |
| Bentley Continental: dangerous defect | 2.6% | n = 29,070 |
| Average age at test | 16.9 vs 12 years | Mercedes-Benz SL vs Bentley Continental |
Why the raw pass rates can mislead
The Mercedes-Benz SL was tested at an older average age (16.9 years against 12), and older cars fail more often whatever they are. That is why the table above also shows failures against cars of the same age, mileage and fuel: it compares the models, not their fleets.
Failure areas side by side
Share of MOT tests that failed on each area, and in brackets how that compares with cars of the same age, mileage and fuel (1.00 = national average). The clearest difference is suspension, where the Mercedes-Benz SL fails 4.3 times as often on an adjusted basis.
| Area | Mercedes-Benz SL | Bentley Continental |
|---|---|---|
| Brakes | 3.6% (-58%) | 1.7% (-72%) |
| Steering | 0.6% (-72%) | 0.2% (-85%) |
| Suspension | 4.8% (-53%) | 0.9% (-89%) |
| Tyres | 4.2% (-14%) | 2.9% (-40%) |
| Road wheels | 0.4% (+60%) | 0.1% (-35%) |
| Lights, reflectors and electrical | 5.0% (-63%) | 2.2% (-79%) |
| Body, chassis and structure | 0.9% (-83%) | 0.4% (-87%) |
| Driver's view of the road | 2.2% (-62%) | 0.9% (-82%) |
| Noise, emissions and leaks | 2.0% (-61%) | 2.2% (-27%) |
| Seat belts and airbags | 0.7% (-58%) | 0.4% (-62%) |
| Registration plates and VIN | 0.5% (+6%) | 0.6% (+85%) |
Pass rate at the same age
Comparing cars of the same age removes most of the fleet-age effect from the raw rates.
| Age at test | Mercedes-Benz SL | Bentley Continental |
|---|---|---|
| 3-4 years | 91.5% (n = 1,218) | 95.2% (n = 2,659) |
| 5-6 years | 90.8% (n = 2,203) | 94.4% (n = 2,624) |
| 7-8 years | 88.5% (n = 3,192) | 94.3% (n = 3,249) |
| 9-10 years | 84.5% (n = 4,008) | 93.8% (n = 2,979) |
| 11-12 years | 82.7% (n = 1,655) | 90.9% (n = 2,614) |
| 13-15 years | 81.4% (n = 3,125) | 89.7% (n = 3,896) |
| 16+ years | 81.2% (n = 27,865) | 87.7% (n = 10,331) |
Most common failure item
- Mercedes-Benz SL · coil spring: fractured or broken (1.21% of tests)
- Bentley Continental · malfunction indicator lamp: inoperative or indicates a malfunction (1.58% of tests)
MOT results reflect how cars are maintained as well as how they are built, so a gap between two models is a difference in test performance, not proof that one is more reliable. For one car, its own MOT history says more than any average.
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About this data. These are MOT test results, not a measure of mechanical reliability: a car's MOT outcome reflects its condition on the day, which depends on how it has been maintained and driven as well as how it was built. Figures cover class 4 vehicles (cars and light vans), normal tests only (retests excluded), outcomes pass, fail and pass after rectification at the station; vehicles at least 2.5 years old at test. Tests from 2023-01-01 to 2024-12-30. “Compared with similar cars” means compared with the national rate for cars of the same age, mileage band and fuel. Contains public sector information licensed under the Open Government Licence v3.0. Makes and models are matched to 73 Auto's vehicle catalogue; tests that can't be matched are left out rather than guessed. See how the MOT figures are produced.