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Mercedes-benz C vs Mercedes-benz Sl55 amg kompressor 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 Sl55 amg kompressor a
95%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz Sl55 amg kompressor a (95%) 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 Sl55 amg kompressor a
MOT pass rate 78% 95% ✓
MOT failure rate 22% 5% ✓
Faults & advisories per test 1.7 1.2 ✓
Dangerous-fault share 3% 0% ✓
Average mileage 112,156 mi 67,339 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 Sl55 amg kompressor a

  1. Front Lower Suspension arm ball joint has slight play Both sides (5.3.4 (a) (i))
  2. Offside Front Wheel bearing has slight play (5.1.3 (a) (i))
  3. Nearside Front Shock absorber has a slightly worn shock absorber pivot (2.7.4)
  4. Offside Front Shock absorber has a slightly worn shock absorber pivot (2.7.4)
  5. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Play in steering rack inner joint(s) Both sides

Reliability FAQ

On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz Sl55 amg kompressor a (95%) 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 Sl55 amg kompressor 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.