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Mercedes-benz C vs Mercedes-benz S350bluetec b-fcy l cdi auto: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Mercedes-benz C
78%
MOT pass rate · 675,043 vehicles
Mercedes-benz S350bluetec b-fcy l cdi auto
80%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz S350bluetec b-fcy l cdi auto (80%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Mercedes-benz C Mercedes-benz S350bluetec b-fcy l cdi auto
MOT pass rate 78% 80% ✓
MOT failure rate 22% 20% ✓
Faults & advisories per test 1.7 ✓ 2.2
Dangerous-fault share 3% ✓ 18%
Average mileage 112,156 mi 104,134 mi
Sample size (vehicles) 675,043 1

Most common faults

Mercedes-benz C

  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. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Under-trays fitted obscuring some underside components
  6. Nearside Front Tyre worn close to the legal limit (4.1.E.1)

Mercedes-benz S350bluetec b-fcy l cdi auto

  1. Front both Brake discs corroded and heat damaged
  2. Offside Front Wheel bearing has slight play (5.1.3 (a) (i))
  3. Offside Rear Lower Suspension arm pin or bush worn but not resulting in excessive movement Front (5.3.4 (a) (i))
  4. Oil leak, but not excessive (8.4.1 (a) (i))
  5. Nearside Front Lower Suspension arm ball joint has slight play (5.3.4 (a) (i))
  6. Nearside Rear Tyre tread depth below requirements of 1.6mm (5.2.3 (e))

Reliability FAQ

On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz S350bluetec b-fcy l cdi auto (80%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Mercedes-benz C report Full Mercedes-benz S350bluetec b-fcy l cdi auto 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.