Bmw 3 Series vs Mercedes-Benz C-Class: Compare by Reg (2026)
Side-by-side comparison of the Bmw 3 Series and Mercedes-Benz C-Class, covering MOT pass rates, running costs, common faults, and overall reliability. Based on 1,582,284 real MOT tests.
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Quick Verdict
The Mercedes-Benz C-Class comes out slightly ahead with a 84% MOT pass rate versus 83% for the Bmw 3 Series. Both cars are competitive in this segment, but the Mercedes-Benz C-Class has a small edge on reliability. Consider test driving both before making your decision.
Bmw 3 Series
83%
MOT pass rate
806,092 tests
Mercedes-Benz C-Class
84%
MOT pass rate
776,192 tests
More reliableFull Comparison: Bmw 3 Series vs Mercedes-Benz C-Class
| Category | Bmw 3 Series | Mercedes-Benz C-Class |
|---|---|---|
| MOT Pass Rate | 83% | 84%Winner |
| MOT Fail Rate | 17% | 16%Winner |
| vs National Avg | +1 pts | +2 ptsWinner |
| Est. Fuel Cost (8,000 mi/yr) | £1,076Winner | £1,115 |
| Insurance Group | 25-35 | 15-25 |
| Est. Depreciation/yr | £2,000-£3,500 | £1,500-£3,000 |
| Engine Size | 2.2L | 2.2L |
| Fuel Type(s) | Diesel, Petrol | Hybrid, Petrol, Diesel |
| Segment | Premium | Family car |
| Avg Mileage | 105,806 mi | 97,926 miWinner |
| MOT Tests Analysed | 806,092 | 776,192 |
| Model Years | 32 years | 32 years |
| Best Year | 2021 (93%)Winner | 2020 (92%) |
| Worst Year | 2000 (77%)Winner | 2004 (72%) |
| Reliability Trend | Improving | Improving |
Common Problems Comparison
Bmw 3 Series Known Issues
- •DPF and emissions issues (diesel models)
- •Higher tyre and brake wear (larger engine)
- •Suspension wear on older models
- •Lighting defects (common on all cars)
Mercedes-Benz C-Class Known Issues
- •DPF and emissions issues (diesel models)
- •Higher tyre and brake wear (larger engine)
- •Suspension wear on older models
- •Lighting defects (common on all cars)
Check a Specific Bmw 3 Series
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Bmw 3 Series vs Mercedes-Benz C-Class FAQ
Which is more reliable, the Bmw 3 Series or Mercedes-Benz C-Class?
Based on MOT data, the Mercedes-Benz C-Class is more reliable with a 84% pass rate, compared to 83% for the Bmw 3 Series.
Which is cheaper to run?
At 8,000 miles per year, the Bmw 3 Series costs around £1,076 in fuel, while the Mercedes-Benz C-Class costs around £1,115. The Bmw 3 Series is cheaper on fuel. Insurance, depreciation, and repair costs also factor into total running costs.
Should I buy a Bmw 3 Series or Mercedes-Benz C-Class?
The Mercedes-Benz C-Class comes out slightly ahead with a 84% MOT pass rate versus 83% for the Bmw 3 Series. Both cars are competitive in this segment, but the Mercedes-Benz C-Class has a small edge on reliability. Consider test driving both before making your decision.
Bmw 3 Series Running Costs
Full breakdown of annual costs, reliability, and MOT data
Mercedes-Benz C-Class Running Costs
Full breakdown of annual costs, reliability, and MOT data
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