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Mercedes-benz C vs Mercedes-benz r320 edition s cdi a: 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 r320 edition s cdi a
67%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz r320 edition s cdi a (67%) 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 r320 edition s cdi a
MOT pass rate 78% ✓ 67%
MOT failure rate 22% ✓ 33%
Faults & advisories per test 1.7 ✓ 1.8
Dangerous-fault share 3% ✓ 10%
Average mileage 112,156 mi 95,446 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 r320 edition s cdi a

  1. Parking brake: efficiency below requirements (3.7.B.7)
  2. Front brake disc worn, pitted or scored, but not seriously weakened n/s and o/s (3.5.1i)
  3. Nearside Front Drive shaft joint constant velocity boot split or insecure, no longer prevents the ingress of dirt (6.1.7 (g) (ii))
  4. Offside Front Drive shaft joint constant velocity boot split or insecure, no longer prevents the ingress of dirt (6.1.7 (g) (ii))
  5. Offside Rear Tyre tread depth below requirements of 1.6mm (5.2.3 (e))
  6. Slight play in front joints

Reliability FAQ

On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz r320 edition s cdi a (67%) 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 r320 edition s cdi a 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.