1991 Mercedes 300 — MOT History by Age

How cars manufactured in 1991 perform at MOT as they age

35 years

Current Age

69.2%

Latest Pass Rate

5,992

Total Tests (All Years)

120,307 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 1991 Mercedes 300 as it ages.

18 yrs65.8%

→ ↑3.3%

19 yrs69.1%

→ ↓1.4%

20 yrs67.7%

→ ↓1.3%

21 yrs66.4%

→ ↑1.5%

22 yrs67.9%

→ ↓1.0%

23 yrs66.9%

→ ↑5.1%

24 yrs72.0%

→ ↑5.0%

25 yrs77.0%

→ ↓3.3%

26 yrs73.7%

→ ↑1.7%

27 yrs75.4%

→ ↑4.1%

28 yrs79.5%

→ ↓10.3%

29 yrs69.2%

📊 View as table

Age	Pass Rate	Tests
18 yrs	65.8%	958
19 yrs	69.1%	844
20 yrs	67.7%	790
21 yrs	66.4%	678
22 yrs	67.9%	605
23 yrs	66.9%	592
24 yrs	72.0%	514
25 yrs	77.0%	479
26 yrs	73.7%	179
27 yrs	75.4%	122
28 yrs	79.5%	127
29 yrs	69.2%	104

Pass Rate Trend

How the 1991 Mercedes 300 pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2020 (29 yrs)	69.2%	104
2019 (28 yrs)	79.5%	127
2018 (27 yrs)	75.4%	122
2017 (26 yrs)	73.7%	179
2016 (25 yrs)	77%	479
2015 (24 yrs)	72%	514
2014 (23 yrs)	66.9%	592
2013 (22 yrs)	67.9%	605
2012 (21 yrs)	66.4%	678
2011 (20 yrs)	67.7%	790
2010 (19 yrs)	69.1%	844
2009 (18 yrs)	65.8%	958

Year-by-Year MOT Results

2009

65.8%

Age (yrs) 18Tests 958Avg Mileage 120,953Top Failure Brakes — 18.5%

2010

69.1%

Age (yrs) 19Tests 844Avg Mileage 120,362Top Failure Brakes — 15.8%

2011

67.7%

Age (yrs) 20Tests 790Avg Mileage 119,852Top Failure Brakes — 15.6%

2012

66.4%

Age (yrs) 21Tests 678Avg Mileage 118,131Top Failure Brakes — 17.6%

2013

67.9%

Age (yrs) 22Tests 605Avg Mileage 116,102Top Failure Brakes — 35.7%

2014

66.9%

Age (yrs) 23Tests 592Avg Mileage 114,197Top Failure Brakes — 36.5%

2015

72.0%

Age (yrs) 24Tests 514Avg Mileage 114,800Top Failure Brakes — 35.2%

2016

77.0%

Age (yrs) 25Tests 479Avg Mileage 113,664Top Failure Brakes — 26.3%

2017

73.7%

Age (yrs) 26Tests 179Avg Mileage 116,797Top Failure Lamps, Reflectors and Electrical Equipment — 24.0%

2018

75.4%

Age (yrs) 27Tests 122Avg Mileage 113,363Top Failure Brakes — 23.8%

2019

79.5%

Age (yrs) 28Tests 127Avg Mileage 113,327Top Failure Brakes — 16.5%

2020

69.2%

Age (yrs) 29Tests 104Avg Mileage 120,307Top Failure Brakes — 28.8%

MOT results for 1991 Mercedes 300 by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	18	65.8%	958	120,953	Brakes — 18.5%
2010	19	69.1%	844	120,362	Brakes — 15.8%
2011	20	67.7%	790	119,852	Brakes — 15.6%
2012	21	66.4%	678	118,131	Brakes — 17.6%
2013	22	67.9%	605	116,102	Brakes — 35.7%
2014	23	66.9%	592	114,197	Brakes — 36.5%
2015	24	72.0%	514	114,800	Brakes — 35.2%
2016	25	77.0%	479	113,664	Brakes — 26.3%
2017	26	73.7%	179	116,797	Lamps, Reflectors and Electrical Equipment — 24.0%
2018	27	75.4%	122	113,363	Brakes — 23.8%
2019	28	79.5%	127	113,327	Brakes — 16.5%
2020	29	69.2%	104	120,307	Brakes — 28.8%

Common MOT Failures

Top failure categories across all test years for 1991 Mercedes 300, with age trends.

Brakes

24.3%

↑ Increases with age

Lamps, Reflectors and Electrical Equipment

21.0%

↑ Increases with age

Suspension

19.5%

↑ Increases with age

Lamps, reflectors and electrical equipment

17.0%

↑ Increases with age

Body, chassis, structure

12.9%

— Consistent

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Suspension	14.8% (18 yrs)	26.0% (29 yrs)	+11.2%	🔴 ↑
Brakes	18.5% (18 yrs)	28.8% (29 yrs)	+10.3%	🔴 ↑
Tyres	11.0% (18 yrs)	18.3% (29 yrs)	+7.3%	🔴 ↑

Other Manufacture Years

1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1998 1999

← Back to Mercedes 300 overview

Looking for the best year to buy? See the full comparison on the Mercedes 300 page →

About This Data

This page shows how Mercedes 300 cars manufactured in 1991 perform at MOT as they age. Data spans from 2009 to 2020, covering 5,992 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.