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1991 Mercedes 500 — MOT History by Age

How cars manufactured in 1991 perform at MOT as they age

35 years
Current Age
73.8%
Latest Pass Rate
2,675
Total Tests (All Years)
81,688 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 as it ages.

18 yrs76.9%
19 yrs74.4%
20 yrs75.8%
21 yrs73.4%
22 yrs74.8%
23 yrs75.9%
24 yrs74.7%
25 yrs79.3%
26 yrs80.2%
27 yrs82.4%
28 yrs71.2%
29 yrs73.8%

Bar chart showing pass rate by car age from 18 to 29 years

Fail Rate %
📊 View as table
AgePass RateTests
18 yrs76.9%364
19 yrs74.4%360
20 yrs75.8%326
21 yrs73.4%297
22 yrs74.8%286
23 yrs75.9%274
24 yrs74.7%241
25 yrs79.3%246
26 yrs80.2%86
27 yrs82.4%68
28 yrs71.2%66
29 yrs73.8%61

Pass Rate Trend

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

Trend shows declining over 12 years

Pass Rate %
📊 View as table
BuiltPass RateTests
2020 (29 yrs)73.8%61
2019 (28 yrs)71.2%66
2018 (27 yrs)82.4%68
2017 (26 yrs)80.2%86
2016 (25 yrs)79.3%246
2015 (24 yrs)74.7%241
2014 (23 yrs)75.9%274
2013 (22 yrs)74.8%286
2012 (21 yrs)73.4%297
2011 (20 yrs)75.8%326
2010 (19 yrs)74.4%360
2009 (18 yrs)76.9%364

Year-by-Year MOT Results

2009
76.9%
Age (yrs) 18Tests 364Avg Mileage 89,778Top Failure Brakes — 11.8%
2010
74.4%
Age (yrs) 19Tests 360Avg Mileage 91,363Top Failure Brakes — 13.1%
2011
75.8%
Age (yrs) 20Tests 326Avg Mileage 89,998Top Failure Lamps, Reflectors and Electrical Equipment — 13.8%
2012
73.4%
Age (yrs) 21Tests 297Avg Mileage 91,822Top Failure Lamps, Reflectors and Electrical Equipment — 13.5%
2013
74.8%
Age (yrs) 22Tests 286Avg Mileage 90,069Top Failure Lamps, Reflectors and Electrical Equipment — 29.7%
2014
75.9%
Age (yrs) 23Tests 274Avg Mileage 93,641Top Failure Lamps, Reflectors and Electrical Equipment — 29.9%
2015
74.7%
Age (yrs) 24Tests 241Avg Mileage 88,246Top Failure Lamps, Reflectors and Electrical Equipment — 19.5%
2016
79.3%
Age (yrs) 25Tests 246Avg Mileage 92,121Top Failure Brakes — 18.3%
2017
80.2%
Age (yrs) 26Tests 86Avg Mileage 83,523Top Failure Brakes — 27.9%
2018
82.4%
Age (yrs) 27Tests 68Avg Mileage 92,494Top Failure Brakes — 20.6%
2019
71.2%
Age (yrs) 28Tests 66Avg Mileage 85,296Top Failure Brakes — 50.0%
2020
73.8%
Age (yrs) 29Tests 61Avg Mileage 81,688Top Failure Lamps, reflectors and electrical equipment — 27.9%

Common MOT Failures

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

Brakes
20.0%
↓ Decreases with age
Lamps, reflectors and electrical equipment
19.3%
↑ Increases with age
Lamps, Reflectors and Electrical Equipment
19.2%
↑ Increases with age
Suspension
15.2%
↑ Increases with age
Tyres
11.5%
↑ Increases with age

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

CategoryAt YoungestAt OldestChangeTrend
Tyres8.2% (18 yrs)18.0% (29 yrs)
+9.8%
🔴 ↑
Brakes11.8% (18 yrs)4.9% (29 yrs)
-6.9%
🟢 ↓

Other Manufacture Years

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 2002 2003
← Back to Mercedes 500 overview

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

About This Data

This page shows how Mercedes 500 cars manufactured in 1991 perform at MOT as they age. Data spans from 2009 to 2020, covering 2,675 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.

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