Diesel Mercedes-Benz Slk: MOT pass rate
77.8% of diesel Mercedes-Benz Slks pass the MOT first time, measured across 13,286 DVSA tests on that fuel type alone. Average mileage at test was 61,020.
Diesel against the other Mercedes-Benz Slk versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Petrol | 74.8% | 43,323 |
| Diesel | 77.8% | 13,286 |
| All Mercedes-Benz Slk | 75.5% | 56,614 |
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 Slk specifically, diesel is the strongest at 77.8%, and this diesel version sits 2.3 points above the 75.5% model average.
What it means if you are buying one
The diesel Mercedes-Benz Slk is the stronger side of this model on MOT data. Still judge the individual car, but the fuel type is a mild point in its favour. 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 Slk had covered 61,020 miles at test, against 74,588 for the petrol. That is around average, so condition and service history will tell you more than the odometer does.
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 Slk page separate age from fuel if you want to isolate one.
Other Mercedes-Benz Slk fuel types
- Petrol Mercedes-Benz Slk - 74.8%