Bmw 3 series vs Bmw 318 i convertible: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Bmw 3 series
75%
MOT pass rate · 996,044 vehicles
Bmw 318 i convertible
90%
MOT pass rate · 195 vehicles
Verdict: On MOT pass rate the Bmw 3 series (75%) and Bmw 318 i convertible (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Bmw 3 series | Bmw 318 i convertible |
|---|---|---|
| MOT pass rate | 75% | 90% ✓ |
| MOT failure rate | 25% | 10% ✓ |
| Faults & advisories per test | 2.0 | 0.0 ✓ |
| Dangerous-fault share | 2% | — ✓ |
| Average mileage | 128,558 mi | 82,144 mi |
| Sample size (vehicles) | 996,044 | 195 |
Most common faults
Bmw 3 series
- 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)
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Under-trays fitted obscuring some underside components
- Oil leak, but not excessive (8.4.1 (a) (i))
Bmw 318 i convertible
No fault breakdown available.
Reliability FAQ
On MOT pass rate the Bmw 3 series (75%) and Bmw 318 i convertible (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Bmw 3 series report Full Bmw 318 i convertible 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.