1978 MG B Gt — MOT History by Age

How cars manufactured in 1978 perform at MOT as they age

48 years

Current Age

78.4%

Latest Pass Rate

6,689

Total Tests (All Years)

42,940 mi

Avg Mileage (Latest)

Data from official DVSA MOT testing records

Insufficient data for same-age comparison.

How This Car Ages

Pass rate progression for the 1978 MG B Gt as it ages.

31 yrs60.0%

→ ↓5.9%

32 yrs54.1%

→ ↑5.5%

33 yrs59.6%

→ ↑2.0%

34 yrs61.6%

→ ↑0.2%

35 yrs61.8%

→ ↓1.4%

36 yrs60.4%

→ ↑1.7%

37 yrs62.1%

→ ↑1.8%

38 yrs63.9%

→ ↑4.3%

39 yrs68.2%

→ ↑5.0%

40 yrs73.2%

→ ↓1.9%

41 yrs71.3%

→ ↑1.1%

42 yrs72.4%

→ ↓3.2%

43 yrs69.2%

→ ↑3.8%

44 yrs73.0%

→ ↑0.8%

45 yrs73.8%

→ ↑4.6%

46 yrs78.4%

📊 View as table

Age	Pass Rate	Tests
31 yrs	60.0%	772
32 yrs	54.1%	711
33 yrs	59.6%	688
34 yrs	61.6%	635
35 yrs	61.8%	579
36 yrs	60.4%	586
37 yrs	62.1%	565
38 yrs	63.9%	563
39 yrs	68.2%	513
40 yrs	73.2%	295
41 yrs	71.3%	174
42 yrs	72.4%	123
43 yrs	69.2%	156
44 yrs	73.0%	111
45 yrs	73.8%	107
46 yrs	78.4%	111

Pass Rate Trend

How the 1978 MG B Gt pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2024 (46 yrs)	78.4%	111
2023 (45 yrs)	73.8%	107
2022 (44 yrs)	73%	111
2021 (43 yrs)	69.2%	156
2020 (42 yrs)	72.4%	123
2019 (41 yrs)	71.3%	174
2018 (40 yrs)	73.2%	295
2017 (39 yrs)	68.2%	513
2016 (38 yrs)	63.9%	563
2015 (37 yrs)	62.1%	565
2014 (36 yrs)	60.4%	586
2013 (35 yrs)	61.8%	579
2012 (34 yrs)	61.6%	635
2011 (33 yrs)	59.6%	688
2010 (32 yrs)	54.1%	711
2009 (31 yrs)	60%	772

Year-by-Year MOT Results

2009High Fail Rate

60.0%

Age (yrs) 31Tests 772Avg Mileage 50,712Top Failure Lamps, Reflectors and Electrical Equipment — 23.1%

2010High Fail Rate

54.1%

Age (yrs) 32Tests 711Avg Mileage 49,930Top Failure Suspension — 24.8%

2011High Fail Rate

59.6%

Age (yrs) 33Tests 688Avg Mileage 51,134Top Failure Lamps, Reflectors and Electrical Equipment — 20.6%

2012High Fail Rate

61.6%

Age (yrs) 34Tests 635Avg Mileage 49,782Top Failure Suspension — 19.5%

2013High Fail Rate

61.8%

Age (yrs) 35Tests 579Avg Mileage 51,020Top Failure Suspension — 45.1%

2014High Fail Rate

60.4%

Age (yrs) 36Tests 586Avg Mileage 50,321Top Failure Suspension — 45.4%

2015High Fail Rate

62.1%

Age (yrs) 37Tests 565Avg Mileage 49,874Top Failure Suspension — 40.4%

2016High Fail Rate

63.9%

Age (yrs) 38Tests 563Avg Mileage 48,681Top Failure Lamps, Reflectors and Electrical Equipment — 40.7%

2017

68.2%

Age (yrs) 39Tests 513Avg Mileage 50,666Top Failure Lamps, Reflectors and Electrical Equipment — 29.4%

2018

73.2%

Age (yrs) 40Tests 295Avg Mileage 47,024Top Failure Suspension — 30.8%

2019

71.3%

Age (yrs) 41Tests 174Avg Mileage 48,637Top Failure Lamps, reflectors and electrical equipment — 24.1%

2020

72.4%

Age (yrs) 42Tests 123Avg Mileage 45,403Top Failure Brakes — 32.5%

2021

69.2%

Age (yrs) 43Tests 156Avg Mileage 49,876Top Failure Suspension — 32.1%

2022

73.0%

Age (yrs) 44Tests 111Avg Mileage 50,366Top Failure Lamps, reflectors and electrical equipment — 22.5%

2023

73.8%

Age (yrs) 45Tests 107Avg Mileage 48,002Top Failure Suspension — 24.3%

2024

78.4%

Age (yrs) 46Tests 111Avg Mileage 42,940Top Failure Noise, emissions and leaks — 13.5%

MOT results for 1978 MG B Gt by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	31	60.0%	772	50,712	Lamps, Reflectors and Electrical Equipment — 23.1%
2010	32	54.1%	711	49,930	Suspension — 24.8%
2011	33	59.6%	688	51,134	Lamps, Reflectors and Electrical Equipment — 20.6%
2012	34	61.6%	635	49,782	Suspension — 19.5%
2013	35	61.8%	579	51,020	Suspension — 45.1%
2014	36	60.4%	586	50,321	Suspension — 45.4%
2015	37	62.1%	565	49,874	Suspension — 40.4%
2016	38	63.9%	563	48,681	Lamps, Reflectors and Electrical Equipment — 40.7%
2017	39	68.2%	513	50,666	Lamps, Reflectors and Electrical Equipment — 29.4%
2018	40	73.2%	295	47,024	Suspension — 30.8%
2019	41	71.3%	174	48,637	Lamps, reflectors and electrical equipment — 24.1%
2020	42	72.4%	123	45,403	Brakes — 32.5%
2021	43	69.2%	156	49,876	Suspension — 32.1%
2022	44	73.0%	111	50,366	Lamps, reflectors and electrical equipment — 22.5%
2023	45	73.8%	107	48,002	Suspension — 24.3%
2024	46	78.4%	111	42,940	Noise, emissions and leaks — 13.5%

Common MOT Failures

Top failure categories across all test years for 1978 MG B Gt, with age trends.

Lamps, Reflectors and Electrical Equipment

28.8%

↓ Decreases with age

Suspension

28.2%

↓ Decreases with age

Brakes

26.4%

↓ Decreases with age

Lamps, reflectors and electrical equipment

18.6%

↓ Decreases with age

Exhaust, Fuel and Emissions

17.9%

— Consistent

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Suspension	21.9% (31 yrs)	9.0% (46 yrs)	-12.9%	🟢 ↓
Brakes	20.2% (31 yrs)	8.1% (46 yrs)	-12.1%	🟢 ↓

Other Manufacture Years

1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981

← Back to MG B Gt overview

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About This Data

This page shows how MG B Gt cars manufactured in 1978 perform at MOT as they age. Data spans from 2009 to 2024, covering 6,689 tests. Pass rates naturally decline with age as components wear.

Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.