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Bmw 3 series vs Bmw 630i: 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 630i
87%
MOT pass rate · 27 vehicles
Verdict: On MOT pass rate the Bmw 3 series (75%) and Bmw 630i (87%) 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 630i
MOT pass rate 75% 87% ✓
MOT failure rate 25% 13% ✓
Faults & advisories per test 2.0 0.8 ✓
Dangerous-fault share 2% 0% ✓
Average mileage 128,558 mi 106,654 mi
Sample size (vehicles) 996,044 27

Most common faults

Bmw 3 series

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  3. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Under-trays fitted obscuring some underside components
  6. Oil leak, but not excessive (8.4.1 (a) (i))

Bmw 630i

  1. FRONT TYRES WORN ON EDGE & CRACKING ON TREADS
  2. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
  3. Nearside Front Suspension arm pin or bush worn but not resulting in excessive movement front (5.3.4 (a) (i))
  4. Offside Front Inner Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
  5. Offside Front Suspension arm pin or bush worn but not resulting in excessive movement front (5.3.4 (a) (i))
  6. Offside Rear Exhaust has a minor leak of exhaust gases (6.1.2 (a))

Reliability FAQ

On MOT pass rate the Bmw 3 series (75%) and Bmw 630i (87%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Bmw 3 series report Full Bmw 630i 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.