Bmw 520 vs Bmw G650 challenge: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Bmw 520
78%
MOT pass rate · 156,398 vehicles
Bmw G650 challenge
75%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Bmw 520 (78%) and Bmw G650 challenge (75%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Bmw 520 | Bmw G650 challenge |
|---|---|---|
| MOT pass rate | 78% ✓ | 75% |
| MOT failure rate | 22% ✓ | 25% |
| Faults & advisories per test | 1.6 ✓ | 2.2 |
| Dangerous-fault share | 3% ✓ | 22% |
| Average mileage | 134,460 mi | 6,360 mi |
| Sample size (vehicles) | 156,398 | 1 |
Most common faults
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))
Bmw G650 challenge
- Rear Brake pedal is short but brake can still be readily applied (1.1.2 (d))
- Wheel alignment slightly misaligned (2.4 (a))
- Rear Shock absorber has a reduced damping effect (5.3.2 (b))
- Front Brake fluid reservoir fluid level below minimum level (1.1.10 (d) (i))
- Front Tyre worn close to the legal limit (5.2.3 (e))
- Front Brake pad(s) less than 1.0 mm thick (1.1.13 (a))
Reliability FAQ
On MOT pass rate the Bmw 520 (78%) and Bmw G650 challenge (75%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Bmw 520 report Full Bmw G650 challenge 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.