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Mercedes-benz C vs Mercedes-benz S 350 l amg line prem exec d 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 S 350 l amg line prem exec d a
87%
MOT pass rate · 24 vehicles
Verdict: On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz S 350 l amg line prem exec d a (87%) 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 S 350 l amg line prem exec d a
MOT pass rate 78% 87% ✓
MOT failure rate 22% 13% ✓
Faults & advisories per test 1.7 0.5 ✓
Dangerous-fault share 3% ✓ 18%
Average mileage 112,156 mi 51,828 mi
Sample size (vehicles) 675,043 24

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 S 350 l amg line prem exec d a

  1. Front Brake disc worn, but not excessively (1.1.14 (a) (i))
  2. Nearside Rear Tyre has a cut in excess of the requirements deep enough to reach the ply or cords (5.2.3 (d) (i))
  3. Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
  4. Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i))
  5. Engine MIL inoperative or indicates a malfunction (8.2.2.2 (g))
  6. Nearside Front Inner Brake pad(s) less than 1.5 mm thick (1.1.13 (a) (ii))

Reliability FAQ

On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz S 350 l amg line prem exec d a (87%) 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 S 350 l amg line prem exec d 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.