1991 Mercedes 500 Sec — MOT History by Age

How cars manufactured in 1991 perform at MOT as they age

35 years

Current Age

70.0%

Latest Pass Rate

489

Total Tests (All Years)

126,842 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 500 Sec as it ages.

18 yrs71.6%

→ ↓4.9%

19 yrs66.7%

→ ↑12.1%

20 yrs78.8%

→ ↓11.6%

21 yrs67.2%

→ ↑1.8%

22 yrs69.0%

→ ↓9.7%

23 yrs59.3%

→ ↑8.6%

24 yrs67.9%

→ ↑2.1%

25 yrs70.0%

📊 View as table

Age	Pass Rate	Tests
18 yrs	71.6%	67
19 yrs	66.7%	72
20 yrs	78.8%	66
21 yrs	67.2%	61
22 yrs	69.0%	58
23 yrs	59.3%	59
24 yrs	67.9%	56
25 yrs	70.0%	50

Pass Rate Trend

How the 1991 Mercedes 500 Sec pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2016 (25 yrs)	70%	50
2015 (24 yrs)	67.9%	56
2014 (23 yrs)	59.3%	59
2013 (22 yrs)	69%	58
2012 (21 yrs)	67.2%	61
2011 (20 yrs)	78.8%	66
2010 (19 yrs)	66.7%	72
2009 (18 yrs)	71.6%	67

Year-by-Year MOT Results

2009

71.6%

Age (yrs) 18Tests 67Avg Mileage 111,106Top Failure Exhaust, Fuel and Emissions — 17.9%

2010

66.7%

Age (yrs) 19Tests 72Avg Mileage 112,584Top Failure Exhaust, Fuel and Emissions — 20.8%

2011

78.8%

Age (yrs) 20Tests 66Avg Mileage 129,015Top Failure Brakes — 10.6%

2012

67.2%

Age (yrs) 21Tests 61Avg Mileage 118,530Top Failure Suspension — 21.3%

2013

69.0%

Age (yrs) 22Tests 58Avg Mileage 128,510Top Failure Brakes — 46.6%

2014High Fail Rate

59.3%

Age (yrs) 23Tests 59Avg Mileage 124,431Top Failure Brakes — 59.3%

2015

67.9%

Age (yrs) 24Tests 56Avg Mileage 128,365Top Failure Brakes — 30.4%

2016

70.0%

Age (yrs) 25Tests 50Avg Mileage 126,842Top Failure Suspension — 38.0%

MOT results for 1991 Mercedes 500 Sec by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	18	71.6%	67	111,106	Exhaust, Fuel and Emissions — 17.9%
2010	19	66.7%	72	112,584	Exhaust, Fuel and Emissions — 20.8%
2011	20	78.8%	66	129,015	Brakes — 10.6%
2012	21	67.2%	61	118,530	Suspension — 21.3%
2013	22	69.0%	58	128,510	Brakes — 46.6%
2014	23	59.3%	59	124,431	Brakes — 59.3%
2015	24	67.9%	56	128,365	Brakes — 30.4%
2016	25	70.0%	50	126,842	Suspension — 38.0%

Common MOT Failures

Top failure categories across all test years for 1991 Mercedes 500 Sec, with age trends.

Brakes

26.7%

↑ Increases with age

Suspension

24.2%

↑ Increases with age

Steering

20.3%

— Consistent

Exhaust, Fuel and Emissions

15.9%

— Consistent

Driver's View of the Road

14.6%

↑ Increases with age

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Lamps, Reflectors and Electrical Equipment	7.5% (18 yrs)	20.0% (25 yrs)	+12.5%	🔴 ↑
Brakes	9.0% (18 yrs)	20.0% (25 yrs)	+11.0%	🔴 ↑
Driver's View of the Road	9.0% (18 yrs)	16.0% (25 yrs)	+7.0%	🔴 ↑
Exhaust, Fuel and Emissions	17.9% (18 yrs)	18.0% (25 yrs)	+0.1%	⚪ —

Other Manufacture Years

1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993

← Back to Mercedes 500 Sec overview

Looking for the best year to buy? See the full comparison on the Mercedes 500 Sec page →

About This Data

This page shows how Mercedes 500 Sec cars manufactured in 1991 perform at MOT as they age. Data spans from 2009 to 2016, covering 489 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.