Mercedes-Benz C-Class vs Mercedes-Benz Slk: MOT reliability compared
Updated 05 September 2026.
20.0%
Mercedes-Benz Slk MOT failure rate, 2.4 pts lower than Mercedes-Benz C-Class
Mercedes-Benz Slk is the more reliable MOT performer: 20.0% of Mercedes-Benz Slk MOTs fail versus 22.4% for Mercedes-Benz C-Class, a 2.4 point gap.
| Metric | Mercedes-Benz C-Class | Mercedes-Benz Slk |
|---|---|---|
| MOT failure rate | 22.4% | 20.0% |
| Tests analysed | 8,209,994 | 1,343,757 |
| Most common failure | Suspension (36.0%) | Suspension (28.8%) |
Questions and answers
Which is more reliable, Mercedes-Benz C-Class or Mercedes-Benz Slk?
Mercedes-Benz Slk is the more reliable MOT performer: 20.0% of Mercedes-Benz Slk MOTs fail versus 22.4% for Mercedes-Benz C-Class, a 2.4 point gap.
What is the MOT failure rate of the Mercedes-Benz C-Class?
22.4% of Mercedes-Benz C-Class MOT tests result in a failure, from 8,209,994 tests.
What is the MOT failure rate of the Mercedes-Benz Slk?
20.0% of Mercedes-Benz Slk MOT tests result in a failure, from 1,343,757 tests.