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Mercedes-benz A-class vs Mercedes-benz Sl 600: reliability comparison

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

Mercedes-benz A-class
78%
MOT pass rate · 362,612 vehicles
Mercedes-benz Sl 600
100%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Mercedes-benz A-class (78%) and Mercedes-benz Sl 600 (100%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Mercedes-benz A-class Mercedes-benz Sl 600
MOT pass rate 78% 100% ✓
MOT failure rate 22% 0% ✓
Faults & advisories per test 1.6 0.3 ✓
Dangerous-fault share 3% 0% ✓
Average mileage 86,210 mi 59,193 mi
Sample size (vehicles) 362,612 1

Most common faults

Mercedes-benz A-class

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Under-trays fitted obscuring some underside components
  5. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

Mercedes-benz Sl 600

  1. all tyres worn on inner edges
  2. Offside Front Lower Suspension arm rubber bush deteriorated but not resulting in excessive movement (2.4.G.2)
  3. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  5. Oil leak, but not excessive (8.4.1 (a) (i))
  6. Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

Reliability FAQ

On MOT pass rate the Mercedes-benz A-class (78%) and Mercedes-benz Sl 600 (100%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Mercedes-benz A-class report Full Mercedes-benz Sl 600 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.