BMW 8 Series 2018: MOT failure rate for its age

15.3% of 674 MOT tests of the BMW 8 Series first registered in 2018 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 107.2 (95% CI 86.5–127.9; 100 = normal for this model at that age): the 2018 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.

BMW 8 Series built in 2018 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	15.3	%	all ages tested	2019–2024	674
Index against this model at the same age (95% CI 86.5–127.9)	107.2	index	100 = normal for this model at that age	2019–2024	674
Rank among this model's 3 build years	2	of 3	1 = fails least for its age	2019–2024	674
Tested in 2024	210	tests	median 41,508 miles	2024	210

Built 2018 against BMW 8 Series normal for the age: first-time MOT failure share at each age, age 3: 13.9% vs 15.2%; age 4: 14.9% vs 12.8%; age 5: 17% vs 14.8%; age 6: 12.9% vs n/a%. Axis from 0% to 20%. DVSA MOT bulk data, 2019–2024.

Check a 2018 BMW 8 Series by registration · All BMW 8 Series 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 2018 BMW 8 Series fail at each age?

Cars built in 2018 were tested at ages 3 to 6 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.

BMW 8 Series built 2018: 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	216 (rough estimate)	13.9	9.9–19.1	15.2	91.2
4	235 (rough estimate)	14.9	10.9–20	12.8	116.4
5	223 (rough estimate)	17	12.7–22.5	14.8	114.8
6	210 (rough estimate)	12.9	9–18.1	not available	not available

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 884 (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 2018 BMW 8 Series?

The most common failure group on cars built in 2018 is tyres: 15.8 items per 100 first tests, against 11.9 across all build years of the BMW 8 Series. These counts are not age-adjusted: cars built in 2018 were tested at ages 3 to 6.

Failure items per 100 first tests, BMW 8 Series built 2018 against the BMW 8 Series in all build years (2019–2024, not age-adjusted)
Failure group	Built 2018, per 100	All build years, per 100	Items
Tyres	15.8	11.9	140

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 885 (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 2018 compare with the years around it?

Among the 3 published build years of the BMW 8 Series, 2018 ranks 2 (1 = fails least for its age). 2019: index 107.7.

BMW 8 Series build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2018	107.2	86.5–127.9	no different (rough estimate)	674
2019	107.7	99.0–116.3	no different (rough estimate)	3,914
2020	97.2	88.5–105.9	no different (rough estimate)	3,574

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 8,162 (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). BMW 8 Series 2018 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/bmw-8-series/2018/

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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