Mercedes-Benz Slc MOT pass rate: 86.4% (8,203 tests, 2025)

The Mercedes-Benz Slc passed 86.4% of its 8,203 MOT tests in 2025 — 8.9 points above the UK average of 77.5%. The median tested example was 8 years old with 34,338 miles on the clock.

86.4%Pass rate (2025)

8,203MOT tests analysed

34,338 miMedian mileage at test

8 yrsMedian age at test

How the Slc compares

Mercedes-Benz Slc

86.4%

UK average (all Class 4 vehicles)

77.5% across 33.1 million tests

Mercedes-Benz average (all models)

80.7%

What fails most on the Mercedes-Benz Slc

Across failed and rectified tests in 2025, these vehicle systems produced the most defects on the Slc:

#	System	Defects recorded	Share
1	Tyres	733	42.6%
2	Suspension	545	31.7%
3	Brakes	173	10.1%
4	Noise, emissions and leaks	110	6.4%
5	Lamps, reflectors and electrical equipment	90	5.2%
6	Road Wheels	68	4.0%

Pre-MOT checklist for Slc owners

Based on the failure profile above, ten minutes with a torch before your test removes the most likely fail items:

Check tread with the 20p test and inspect sidewalls for cracking — tyres close to the limit are the country’s most common advisory
Bounce each corner and listen for clonks over speed bumps — suspension is this model’s (and the UK’s) top failure system
Feel for a spongy pedal or pulling to one side; check pad wear through the wheel spokes if visible
A blowing exhaust or visible smoke will fail; warm the engine fully before the test
Walk round with all lights on: one blown bulb is the most avoidable fail there is

Check the engine before the tester does

A stored fault code with the engine light on is an automatic Major defect. Scan and clear resolved faults before booking.

Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
Autel UK testersAutel professional-grade diagnostic testers

Slc pass rate by registration year

Registration year	Tests	Pass rate	Vs same-age	Median mileage
2016	6,669	85.9%	+4.6 pts	37,359
2017	10,191	86.1%	+2.1 pts	32,089
2018	4,402	90.4%	+4.1 pts	25,549
2019	2,926	92.0%	+3.6 pts	18,656

Check a specific Slc before you buy

Pass rates describe the model; they can’t tell you about the one car you’re looking at. Run its plate through our free MOT history check to see its personal record of failures, advisories and mileage readings.

Other Mercedes-Benz models

C78.2% pass rate · 343,551 tests A-Class77.8% pass rate · 232,671 tests E79.7% pass rate · 215,896 tests A89.1% pass rate · 93,733 tests Vito73.4% pass rate · 81,263 tests GLC87.2% pass rate · 65,847 tests GLA83.1% pass rate · 64,404 tests CLA82.7% pass rate · 62,279 tests

FAQs

What is the MOT pass rate for a Mercedes-Benz Slc?

In 2025, 86.4% of 8,203 first MOT tests on the Mercedes-Benz Slc were passes (UK average: 77.5%). Data: DVSA anonymised MOT results.

What does the Slc fail its MOT on most?

The biggest defect group is tyres (42.6% of its recorded defects), followed by suspension.

Is the Mercedes-Benz Slc reliable?

MOT pass rate is one lens on durability: at 86.4% it performs above the national average at a median age of 8 years and 34,338 miles. Always check the individual car's history too.

Source: DVSA Anonymised MOT tests and results, 2025 extract (Class 4 initial tests only; retests excluded). Contains public sector information licensed under the Open Government Licence v3.0. Figures rounded to one decimal place.