Diesel Mercedes-Benz Slc: MOT pass rate

83.8% of diesel Mercedes-Benz Slcs pass the MOT first time, measured across 2,831 DVSA tests on that fuel type alone. Average mileage at test was 42,070.

Diesel against the other Mercedes-Benz Slc 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 Slc specifically, petrol is the strongest at 89.4%, and this diesel version sits 3.7 points below the 87.5% model average.

What it means if you are buying one

The diesel Mercedes-Benz Slc fails more often than the model average, so budget for the items that catch this fuel type and treat a fresh MOT as worth paying for. 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 Slc had covered 42,070 miles at test, against 29,852 for the petrol. That is below average for a car this age, worth a mileage-consistency check since an unusually low reading is sometimes clocking rather than luck.

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 Slc page separate age from fuel if you want to isolate one.

Most common MOT failures on a diesel Mercedes-Benz Slc

1. Any fracture or welding defect on a wheel, 0.6% of tests (10.77x the national rate for this defect)
2. ESC MIL indicates a system malfunction, 0.6% of tests (3.13x the national rate for this defect)
3. Warning device shows system malfunction, 1% of tests (2.47x the national rate for this defect)
4. A tyre cords visible or damaged, 3.9% of tests (2.35x the national rate for this defect)
5. A tyre seriously damaged, 3.6% of tests (1.28x the national rate for this defect)
6. A suspension pin, bush or joint excessively worn, 2.9% of tests
7. A spring or spring component fractured or seriously weakened, 2.4% of tests
8. Tyre tread depth not in accordance with the requirements, 2.1% of tests
9. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 1.7% of tests
10. Engine MIL illuminated indicating a malfunction, 1.4% of tests

From 2,841 DVSA-tracked diesel Mercedes-Benz Slc tests, 2024, split out from the Mercedes-Benz Slc's other fuel types. DVSA testers marked 9.05% 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 Slc

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

1. A wheel bearing with excessive play, 3.7% of tests (5.7x the national rate for this defect)
2. A wheel badly distorted or wear between wheel and hub at spigot mounting, 2.2% of tests (2.08x the national rate for this defect)
3. Tyre tread depth not in accordance with the requirements, 30.7% of tests, also fails
4. A tyre seriously damaged, 15.3% of tests, also fails
5. Brake disc or drum excessively weakened, insecure or fractured, 7.5% of tests
6. a brake lining or pad worn below 1.5mm, 3.6% of tests
7. Brake disc or drum significantly and obviously worn, 3.5% of tests
8. A suspension pin, bush or joint excessively worn, 2.5% of tests, also fails
9. A shock absorber damaged to the extent that it does not function or showing signs of severe leakage, 0.6% of tests
10. Number plate inscription missing or illegible, 0.5% of tests

From 2,841 DVSA-tracked diesel Mercedes-Benz Slc tests, 2024.

Other Mercedes-Benz Slc fuel types

• Petrol Mercedes-Benz Slc - 89.4%

All Mercedes-Benz Slc MOT data · Every model