1975 Triumph Stag Auto — MOT History by Age

How cars manufactured in 1975 perform at MOT as they age

51 years

Current Age

97.6%

Latest Pass Rate

1,789

Total Tests (All Years)

64,934 mi

Avg Mileage (Latest)

Data from official DVSA MOT testing records

Best vintage for Stag Auto

Insufficient data for same-age comparison.

How This Car Ages

Pass rate progression for the 1975 Triumph Stag Auto as it ages.

34 yrs60.3%

→ ↑5.7%

35 yrs66.0%

→ ↑3.2%

36 yrs69.2%

→ ↓3.6%

37 yrs65.6%

→ ↓1.8%

38 yrs63.8%

→ ↑7.6%

39 yrs71.4%

→ ↓3.9%

40 yrs67.5%

→ ↑7.3%

41 yrs74.8%

→ ↑3.3%

42 yrs78.1%

→ ↓11.4%

43 yrs66.7%

→ ↑13.3%

44 yrs80.0%

→ ↓9.7%

45 yrs70.3%

→ ↑8.1%

46 yrs78.4%

→ ↑5.4%

47 yrs83.8%

→ ↓2.8%

48 yrs81.0%

→ ↑16.6%

49 yrs97.6%

📊 View as table

Age	Pass Rate	Tests
34 yrs	60.3%	174
35 yrs	66.0%	162
36 yrs	69.2%	172
37 yrs	65.6%	154
38 yrs	63.8%	152
39 yrs	71.4%	154
40 yrs	67.5%	163
41 yrs	74.8%	163
42 yrs	78.1%	169
43 yrs	66.7%	72
44 yrs	80.0%	45
45 yrs	70.3%	37
46 yrs	78.4%	51
47 yrs	83.8%	37
48 yrs	81.0%	42
49 yrs	97.6%	42

Pass Rate Trend

How the 1975 Triumph Stag Auto pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2024 (49 yrs)	97.6%	42
2023 (48 yrs)	81%	42
2022 (47 yrs)	83.8%	37
2021 (46 yrs)	78.4%	51
2020 (45 yrs)	70.3%	37
2019 (44 yrs)	80%	45
2018 (43 yrs)	66.7%	72
2017 (42 yrs)	78.1%	169
2016 (41 yrs)	74.8%	163
2015 (40 yrs)	67.5%	163
2014 (39 yrs)	71.4%	154
2013 (38 yrs)	63.8%	152
2012 (37 yrs)	65.6%	154
2011 (36 yrs)	69.2%	172
2010 (35 yrs)	66%	162
2009 (34 yrs)	60.3%	174

Year-by-Year MOT Results

2009High Fail Rate

60.3%

Age (yrs) 34Tests 174Avg Mileage 59,422Top Failure Lamps, Reflectors and Electrical Equipment — 20.7%

2010

66.0%

Age (yrs) 35Tests 162Avg Mileage 53,513Top Failure Suspension — 16.7%

2011

69.2%

Age (yrs) 36Tests 172Avg Mileage 55,345Top Failure Lamps, Reflectors and Electrical Equipment — 18.0%

2012

65.6%

Age (yrs) 37Tests 154Avg Mileage 56,244Top Failure Lamps, Reflectors and Electrical Equipment — 22.1%

2013High Fail Rate

63.8%

Age (yrs) 38Tests 152Avg Mileage 56,613Top Failure Lamps, Reflectors and Electrical Equipment — 50.7%

2014

71.4%

Age (yrs) 39Tests 154Avg Mileage 56,123Top Failure Lamps, Reflectors and Electrical Equipment — 44.8%

2015

67.5%

Age (yrs) 40Tests 163Avg Mileage 55,017Top Failure Lamps, Reflectors and Electrical Equipment — 30.1%

2016

74.8%

Age (yrs) 41Tests 163Avg Mileage 54,133Top Failure Suspension — 33.1%

2017

78.1%

Age (yrs) 42Tests 169Avg Mileage 55,353Top Failure Brakes — 33.7%

2018

66.7%

Age (yrs) 43Tests 72Avg Mileage 50,773Top Failure Brakes — 31.9%

2019

80.0%

Age (yrs) 44Tests 45Avg Mileage 58,941Top Failure Brakes — 26.7%

2020

70.3%

Age (yrs) 45Tests 37Avg Mileage 60,699Top Failure Lamps, reflectors and electrical equipment — 48.6%

2021

78.4%

Age (yrs) 46Tests 51Avg Mileage 62,022Top Failure Lamps, reflectors and electrical equipment — 27.5%

2022

83.8%

Age (yrs) 47Tests 37Avg Mileage 58,613Top Failure Lamps, reflectors and electrical equipment — 54.1%

2023

81.0%

Age (yrs) 48Tests 42Avg Mileage 59,781Top Failure Suspension — 40.5%

2024

97.6%

Age (yrs) 49Tests 42Avg Mileage 64,934Top Failure Suspension — 11.9%

MOT results for 1975 Triumph Stag Auto by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	34	60.3%	174	59,422	Lamps, Reflectors and Electrical Equipment — 20.7%
2010	35	66.0%	162	53,513	Suspension — 16.7%
2011	36	69.2%	172	55,345	Lamps, Reflectors and Electrical Equipment — 18.0%
2012	37	65.6%	154	56,244	Lamps, Reflectors and Electrical Equipment — 22.1%
2013	38	63.8%	152	56,613	Lamps, Reflectors and Electrical Equipment — 50.7%
2014	39	71.4%	154	56,123	Lamps, Reflectors and Electrical Equipment — 44.8%
2015	40	67.5%	163	55,017	Lamps, Reflectors and Electrical Equipment — 30.1%
2016	41	74.8%	163	54,133	Suspension — 33.1%
2017	42	78.1%	169	55,353	Brakes — 33.7%
2018	43	66.7%	72	50,773	Brakes — 31.9%
2019	44	80.0%	45	58,941	Brakes — 26.7%
2020	45	70.3%	37	60,699	Lamps, reflectors and electrical equipment — 48.6%
2021	46	78.4%	51	62,022	Lamps, reflectors and electrical equipment — 27.5%
2022	47	83.8%	37	58,613	Lamps, reflectors and electrical equipment — 54.1%
2023	48	81.0%	42	59,781	Suspension — 40.5%
2024	49	97.6%	42	64,934	Suspension — 11.9%

Common MOT Failures

Top failure categories across all test years for 1975 Triumph Stag Auto, with age trends.

Lamps, Reflectors and Electrical Equipment

28.8%

↑ Increases with age

Lamps, reflectors and electrical equipment

28.6%

↓ Decreases with age

Suspension

25.0%

— Consistent

Brakes

23.5%

↓ Decreases with age

Body, chassis, structure

22.5%

↓ Decreases with age

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Brakes	18.4% (34 yrs)	4.8% (49 yrs)	-13.6%	🟢 ↓
Steering	13.2% (34 yrs)	2.4% (49 yrs)	-10.8%	🟢 ↓
Suspension	13.8% (34 yrs)	11.9% (49 yrs)	-1.9%	⚪ —

Other Manufacture Years

1971 1972 1973 1974 1975 1976 1977 1978

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About This Data

This page shows how Triumph Stag Auto cars manufactured in 1975 perform at MOT as they age. Data spans from 2009 to 2024, covering 1,789 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.