Mercedes-Benz SLC 2020: MOT failure rate for its age

8.6% of 1,184 MOT tests of the Mercedes-Benz SLC first registered in 2020 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 93.5 (95% CI 75.4–111.7; 100 = normal for this model at that age): the 2020 build year is no different from other years of the same model at the same age. This is a rough estimate from a smaller sample.

Mercedes-Benz SLC built in 2020 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	8.6	%	all ages tested	2019–2024	1184
Index against this model at the same age (95% CI 75.4–111.7)	93.5	index	100 = normal for this model at that age	2019–2024	1184
Rank among this model's 5 build years	2	of 5	1 = fails least for its age	2019–2024	1184
Tested in 2024	590	tests	median 16,003 miles	2024	590

Built 2020 against Mercedes-Benz SLC normal for the age: first-time MOT failure share at each age, age 3: 8.8% vs 9%; age 4: 8.5% vs 9.4%. Axis from 0% to 10%. DVSA MOT bulk data, 2019–2024.

Check a 2020 Mercedes-Benz SLC by registration · All Mercedes-Benz SLC MOT statistics · Download the build-year table (CSV)

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).

How does the 2020 Mercedes-Benz SLC fail at each age?

Cars built in 2020 were tested at ages 3 to 4 between 2019 and 2024. Each row compares their first-time failure share with what this model normally shows at that age, after allowing for the overall failure level of each test year.

Mercedes-Benz SLC built 2020: first-time MOT failure by age, against the model's normal rate at that age (2019–2024)
Age	Tests	Failed, %	95% interval	Normal for this model at that age, %	Index (100 = normal)
3	594	8.8	6.7–11.3	9	97.4
4	590	8.5	6.5–11	9.4	89.8

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 1,184 (initial tests) · Method: normal rate = this model's first-time failure share at that age across its build years (cells of 400+ tests), adjusted for each test year's overall level; cells of 30+ tests, under 500 marked rough · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

What fails most on the 2020 Mercedes-Benz SLC?

The most common failure group on cars built in 2020 is tyres: 7.1 items per 100 first tests, against 8.9 across all build years of the Mercedes-Benz SLC. These counts are not age-adjusted: cars built in 2020 were tested at ages 3 to 4.

Failure items per 100 first tests, Mercedes-Benz SLC built 2020 against the Mercedes-Benz SLC in all build years (2019–2024, not age-adjusted)
Failure group	Built 2020, per 100	All build years, per 100	Items
Tyres	7.1	8.9	85

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 1,198 (initial tests of this build year) · Method: failure items grouped by DVSA's top-level defect groups, per 100 initial tests; groups with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How does 2020 compare with the years around it?

Among the 5 published build years of the Mercedes-Benz SLC, 2020 ranks 2 (1 = fails least for its age). 2019: index 81.1.

Mercedes-Benz SLC build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2016	106.4	101.4–111.3	worse	13,430
2017	103.5	99.2–107.9	no different	18,344
2018	94.6	87.1–102.1	no different	6,116
2019	81.1	70.8–91.4	better (rough estimate)	3,033
2020	93.5	75.4–111.7	no different (rough estimate)	1,184

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 42,107 (initial tests) · Method: observed failures against those expected for the same model at the same ages, test-year level adjusted; verdict follows the printed one-decimal bound · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How to cite this page

MOT Risk Index (2026). Mercedes-Benz SLC 2020 MOT statistics (data release dvsa-2024-v2; full dataset motriskindex-families-2024-v5, DOI 10.5281/zenodo.22975051), updated 30 September 2026. motriskindex.co.uk/cars/mercedes-slc/2020/

How every figure is calculated: methodology. Age, test year and build year are tied together (age = test year − build year), so the test-year level is taken as observed, not estimated.

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