Bmw 4.4 vs Bmw 520: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Bmw 4.4
77%
MOT pass rate · 1 vehicles
Bmw 520
78%
MOT pass rate · 156,398 vehicles
Verdict: On MOT pass rate the Bmw 4.4 (77%) and Bmw 520 (78%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Bmw 4.4 | Bmw 520 |
|---|---|---|
| MOT pass rate | 77% | 78% ✓ |
| MOT failure rate | 23% | 22% ✓ |
| Faults & advisories per test | 2.1 | 1.6 ✓ |
| Dangerous-fault share | 0% ✓ | 3% |
| Average mileage | 134,505 mi | 134,460 mi |
| Sample size (vehicles) | 1 | 156,398 |
Most common faults
Bmw 4.4
- Oil leak, but not excessive (8.4.1 (a) (i))
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Registration plate lamp inoperative in the case of multiple lamps or light sources (4.7.1 (b) (i))
- Nearside Tyre worn close to the legal limit (4.1.E.1)
- Oil leak
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
Bmw 520
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Under-trays fitted obscuring some underside components
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate the Bmw 4.4 (77%) and Bmw 520 (78%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Bmw 4.4 report Full Bmw 520 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.