Mercedes SLC Reliability: Common Problems and Years to Avoid
What the Mercedes SLC fails its MOT on, with rough repair costs, and how each model year's MOT pass rate compares with other cars of the same age. Based on 18,733 MOT tests across 6 model years (DVSA data for tests carried out in 2024, retests included).
Segment: premium performance | Fuel: Petrol
91%
Mercedes SLC pass rate
87%
Mercedes average
82%
All-model average
The Mercedes SLC has an average MOT pass rate of 91%, which is 4 points above the Mercedes average and 9 points above the average across all models in our data. Newer Mercedes SLCs pass their MOT more often than older ones, by 4 percentage points on average, which is mostly down to age and wear.
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What the Mercedes SLC Fails Its MOT On
Of the 1,272 MOT tests on the Mercedes SLC that failed at the first attempt in 2025, the share that failed on each part of the test, next to the share for all cars and vans of the same ages. A test that failed on two areas counts in both.
Tyres
42%Cars and vans the same age: 28% (the SLC fails on this more often) · Typical repair £50-£300
Suspension
33%Cars and vans the same age: 25% (the SLC fails on this more often) · Typical repair £150-£600
Lights and electrics
13%Cars and vans the same age: 28% (the SLC fails on this less often) · Typical repair £15-£200
Brakes
10%Cars and vans the same age: 20% (the SLC fails on this less often) · Typical repair £80-£450
Exhaust, emissions and leaks
9.5%Cars and vans the same age: 9.2% · Typical repair £80-£800
The 3 single faults it failed on most
- Tyre has ply or cords exposed (15% of failed tests, tyres)
- Coil spring: fractured or broken (13% of failed tests, suspension)
- Tyre has a cut deep enough to reach the ply or cords (12% of failed tests, tyres)
Source: CarCostCheck analysis of DVSA anonymised MOT test results and failure items for 2025: first attempt at each MOT, fail and pass-after-repair defects, DVSA's defect categories (names shortened). Repair costs are rough UK ranges, not quotes. Method and national figures: MOT failure reasons 2025.
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Mercedes SLC Years to Avoid
Every car in the 2024 MOT data was tested at the same age as the other cars first registered that year, so each SLC year is compared with all cars from the same year. Years with 1,000+ tests that were at least three years old are included.
Failed more often than cars their age
No year passed 3 or more points less often than other cars of the same age.
A lower pass rate means that year failed its MOT more often in 2024; it does not mean every car from that year is bad. Old cars still on the road are often the best-kept ones, which can lift the pass rates of the oldest years. How a car has been looked after matters more, so check the MOT history of the car you are looking at.
Mercedes SLC Reliability by Year
MOT pass rate for each model year, from DVSA data for tests carried out in 2024 (retests included). Newer cars usually pass more often simply because they are younger. All Cars is the pass rate of every car first registered that year, with the gap in points. Highest and lowest are marked among years with 100+ tests that were at least three years old when tested. Fuel and engine size are a guide only.
Mercedes SLC Running Costs
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Mercedes SLC FAQ
What are the most common Mercedes SLC problems?
In 2025, MOT tests on the Mercedes SLC that failed at the first attempt most often failed on tyres (42% of the 1,272 failed tests), suspension (33%) and lights and electrics (13%). The single most common fault was "Tyre has ply or cords exposed" (15%). Across 18,733 MOT tests (DVSA MOT data for tests in 2024, retests included), 91% ended in a pass.
Is the Mercedes SLC reliable?
The Mercedes SLC has an average MOT pass rate of 91%, from 18,733 MOT tests (DVSA MOT data for tests in 2024, retests included). Comparing each model year with all cars first registered the same year, so that age is allowed for, it passed 3 points more often on average, a better than average result for its age.
Which Mercedes SLC years should I avoid?
No Mercedes SLC year with 1,000+ tests passed 3 or more points less often than all cars first registered the same year (DVSA MOT data for tests in 2024, retests included). The years that passed most often for their age were the 2017 (90% of 7,762 tests passed, against 87% for all 2017 cars), the 2016 (89% of 5,408 tests passed, against 86% for all 2016 cars) and the 2018 (92% of 3,335 tests passed, against 89% for all 2018 cars). A year's pass rate does not tell you about one car, so check the MOT history of the car you are buying.
How much does it cost to fix common Mercedes SLC faults?
As a rough guide, brake work on a Mercedes SLC typically costs £80-£450 and suspension repairs £150-£600, while exhaust and emissions fixes can cost £80-£800. Lighting and wiper fixes are usually under £200.
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Other Mercedes Models
Common problems pages for other Mercedes models