Petrol Mercedes-Benz Slk: MOT pass rate

74.8% of petrol Mercedes-Benz Slks pass the MOT first time, measured across 43,323 DVSA tests on that fuel type alone. Average mileage at test was 74,588.

Petrol against the other Mercedes-Benz Slk versions

Why the fuel type changes the number

Petrol cars avoid the DPF and emissions failures that catch diesels, and usually fail on the same consumables as any other car.

On the Mercedes-Benz Slk specifically, diesel is the strongest at 77.8%, and this petrol version sits 0.7 points below the 75.5% 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. 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 petrol Mercedes-Benz Slk had covered 74,588 miles at test, against 61,020 for the diesel. That is a shade above the middle of the range, still ordinary wear rather than a red flag, but worth checking against the service book for the car's age.

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 petrol Mercedes-Benz Slk

1. A suspension component excessively damaged or corroded, 1.6% of tests (4.66x the national rate for this defect)
2. An SRS malfunction indicator lamp (MIL) indicates a system malfunction, 1.3% of tests (3.25x the national rate for this defect)
3. Brake pipe damaged or excessively corroded, 2.8% of tests (2.6x the national rate for this defect)
4. A spring or spring component fractured or seriously weakened, 5.7% of tests (2.51x the national rate for this defect)
5. A suspension pin, bush or joint excessively worn, 5.8% of tests
6. A tyre seriously damaged, 2.7% of tests
7. Tyre tread depth not in accordance with the requirements, 2.6% of tests
8. The aim of a headlamp is not within limits laid down in the requirements, 2.4% of tests
9. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 2% of tests
10. Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 1.8% of tests

From 43,616 DVSA-tracked petrol Mercedes-Benz Slk tests, 2024, split out from the Mercedes-Benz Slk's other fuel types. DVSA testers marked 3.82% 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 petrol Mercedes-Benz Slk

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

1. A wheel bearing with excessive play, 6.6% of tests (10.13x the national rate for this defect)
2. A flexible brake hose excessively damaged, deteriorated, chafed, twisted or stretched, 4.6% of tests (8.16x the national rate for this defect)
3. Brake pipe damaged or excessively corroded, 21.2% of tests (3.42x the national rate for this defect), also fails
4. Lamp emitted colour, position or intensity not in accordance with the requirements, 3.4% of tests (2.48x the national rate for this defect)
5. Exhaust system leaking or insecure, 5.1% of tests (1.81x the national rate for this defect)
6. The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, 2.6% of tests (1.73x the national rate for this defect)
7. A suspension component excessively damaged or corroded, 8.2% of tests (1.59x the national rate for this defect), also fails
8. Tyre tread depth not in accordance with the requirements, 23.2% of tests, also fails
9. A tyre seriously damaged, 17.1% of tests, also fails
10. A suspension pin, bush or joint excessively worn, 12.6% of tests, also fails

From 43,616 DVSA-tracked petrol Mercedes-Benz Slk tests, 2024.

Other Mercedes-Benz Slk fuel types

• Diesel Mercedes-Benz Slk - 77.8%

All Mercedes-Benz Slk MOT data · Every model