Diesel Mercedes-Benz Cls: MOT pass rate
76.5% of diesel Mercedes-Benz Cls pass the MOT first time, measured across 20,881 DVSA tests on that fuel type alone. Average mileage at test was 93,151.
Diesel against the other Mercedes-Benz Cls versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Diesel | 76.5% | 20,881 |
| Petrol | 79.5% | 2,608 |
| All Mercedes-Benz Cls | 76.9% | 23,621 |
Why the fuel type changes the number
Diesels carry DPFs, EGR valves and stricter smoke limits, so emissions and exhaust faults account for failures petrol cars never see.
On the Mercedes-Benz Cls specifically, petrol is the strongest at 79.5%, and this diesel version sits 0.4 points below the 76.9% model average.
What it means if you are buying one
There is little to choose between fuel types on this model, so decide on running costs and mileage rather than MOT record. Check the exact car, decode the VIN and check the mileage before you bid.
Mileage is part of the answer
The average diesel Mercedes-Benz Cls had covered 93,151 miles at test, against 85,773 for the petrol. That is above average, the point where suspension bushes, drop links and exhaust corrosion start showing up as advisories before they become failures.
Fuel type and mileage are tangled together: diesels are usually bought by higher-mileage drivers, so some of any gap between fuels is the miles rather than the engine. The per-year figures on the Mercedes-Benz Cls page separate age from fuel if you want to isolate one.
Other Mercedes-Benz Cls fuel types
- Petrol Mercedes-Benz Cls - 79.5%