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

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. Buying a damaged one? run it through the analyzer, 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.

Most common MOT failures on a diesel Mercedes-Benz Slk

1. ESC MIL indicates a system malfunction, 0.8% of tests (4x the national rate for this defect)
2. Warning device shows system malfunction, 1.4% of tests (3.48x the national rate for this defect)
3. A spring or spring component fractured or seriously weakened, 6% of tests (2.65x the national rate for this defect)
4. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 4.4% of tests (2.41x the national rate for this defect)
5. A tyre cords visible or damaged, 3.9% of tests (2.31x the national rate for this defect)
6. A tyre seriously damaged, 3.9% of tests (1.39x the national rate for this defect)
7. Brake disc or drum significantly and obviously worn, 1% of tests (1.27x the national rate for this defect)
8. Tyre tread depth not in accordance with the requirements, 3.8% of tests (1.19x the national rate for this defect)
9. A suspension pin, bush or joint excessively worn, 3.3% of tests
10. Brake pipe damaged or excessively corroded, 1.1% of tests

From 13,345 DVSA-tracked diesel Mercedes-Benz Slk tests, 2024, split out from the Mercedes-Benz Slk's other fuel types. DVSA testers marked 7.58% of these flagged defects as "dangerous", against 5.11% nationally. See which fuel type fails on the most dangerous defects nationally for how that compares across the whole fleet.

Most common MOT advisories on a diesel Mercedes-Benz Slk

Flagged but doesn't fail the car, a different list from the failures above.

1. A wheel bearing with excessive play, 4.8% of tests (7.46x the national rate for this defect)
2. A wheel badly distorted or wear between wheel and hub at spigot mounting, 2.2% of tests (2.04x the national rate for this defect)
3. Brake disc or drum significantly and obviously worn, 4.8% of tests (1.52x the national rate for this defect), also fails
4. Excessive fluctuation in brake effort through each wheel revolution., 1% of tests (1.23x the national rate for this defect)
5. Tyre tread depth not in accordance with the requirements, 30.9% of tests (1.16x the national rate for this defect), also fails
6. Brake disc or drum excessively weakened, insecure or fractured, 14.1% of tests
7. A tyre seriously damaged, 13.6% of tests, also fails
8. A suspension pin, bush or joint excessively worn, 6.6% of tests, also fails
9. Brake pipe damaged or excessively corroded, 6.4% of tests, also fails
10. a brake lining or pad worn below 1.5mm, 5.3% of tests

From 13,345 DVSA-tracked diesel Mercedes-Benz Slk tests, 2024.

Other Mercedes-Benz Slk fuel types

• Petrol Mercedes-Benz Slk - 74.8%

All Mercedes-Benz Slk MOT data · Every model