1999 Mercedes Sl 500 — MOT History by Age

How cars manufactured in 1999 perform at MOT as they age

27 years

Current Age

79.5%

Latest Pass Rate

789

Total Tests (All Years)

76,465 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 1999 Mercedes Sl 500 as it ages.

10 yrs79.2%

→ ↓9.2%

11 yrs70.0%

→ ↑5.9%

12 yrs75.9%

→ ↑4.4%

13 yrs80.3%

→ ↓2.4%

14 yrs77.9%

→ ↑4.5%

15 yrs82.4%

→ ↑3.3%

16 yrs85.7%

→ ↓8.9%

17 yrs76.8%

→ ↓7.8%

18 yrs69.0%

→ ↑14.7%

19 yrs83.7%

→ ↓2.3%

20 yrs81.4%

→ ↓1.9%

21 yrs79.5%

📊 View as table

Age	Pass Rate	Tests
10 yrs	79.2%	77
11 yrs	70.0%	80
12 yrs	75.9%	83
13 yrs	80.3%	71
14 yrs	77.9%	77
15 yrs	82.4%	74
16 yrs	85.7%	70
17 yrs	76.8%	69
18 yrs	69.0%	58
19 yrs	83.7%	43
20 yrs	81.4%	43
21 yrs	79.5%	44

Pass Rate Trend

How the 1999 Mercedes Sl 500 pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2020 (21 yrs)	79.5%	44
2019 (20 yrs)	81.4%	43
2018 (19 yrs)	83.7%	43
2017 (18 yrs)	69%	58
2016 (17 yrs)	76.8%	69
2015 (16 yrs)	85.7%	70
2014 (15 yrs)	82.4%	74
2013 (14 yrs)	77.9%	77
2012 (13 yrs)	80.3%	71
2011 (12 yrs)	75.9%	83
2010 (11 yrs)	70%	80
2009 (10 yrs)	79.2%	77

Year-by-Year MOT Results

2009

79.2%

Age (yrs) 10Tests 77Avg Mileage 59,581Top Failure Lamps, Reflectors and Electrical Equipment — 11.7%

2010

70.0%

Age (yrs) 11Tests 80Avg Mileage 61,461Top Failure Lamps, Reflectors and Electrical Equipment — 18.8%

2011

75.9%

Age (yrs) 12Tests 83Avg Mileage 66,064Top Failure Lamps, Reflectors and Electrical Equipment — 12.0%

2012

80.3%

Age (yrs) 13Tests 71Avg Mileage 68,824Top Failure Lamps, Reflectors and Electrical Equipment — 8.5%

2013

77.9%

Age (yrs) 14Tests 77Avg Mileage 68,550Top Failure Tyres — 16.9%

2014

82.4%

Age (yrs) 15Tests 74Avg Mileage 73,958Top Failure Lamps, Reflectors and Electrical Equipment — 23.0%

2015

85.7%

Age (yrs) 16Tests 70Avg Mileage 76,691Top Failure Lamps, Reflectors and Electrical Equipment — 24.3%

2016

76.8%

Age (yrs) 17Tests 69Avg Mileage 74,765Top Failure Brakes — 36.2%

2017

69.0%

Age (yrs) 18Tests 58Avg Mileage 75,845Top Failure Lamps, Reflectors and Electrical Equipment — 36.2%

2018

83.7%

Age (yrs) 19Tests 43Avg Mileage 82,594Top Failure Tyres — 14.0%

2019

81.4%

Age (yrs) 20Tests 43Avg Mileage 80,303Top Failure Lamps, reflectors and electrical equipment — 20.9%

2020

79.5%

Age (yrs) 21Tests 44Avg Mileage 76,465Top Failure Tyres — 18.2%

MOT results for 1999 Mercedes Sl 500 by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	10	79.2%	77	59,581	Lamps, Reflectors and Electrical Equipment — 11.7%
2010	11	70.0%	80	61,461	Lamps, Reflectors and Electrical Equipment — 18.8%
2011	12	75.9%	83	66,064	Lamps, Reflectors and Electrical Equipment — 12.0%
2012	13	80.3%	71	68,824	Lamps, Reflectors and Electrical Equipment — 8.5%
2013	14	77.9%	77	68,550	Tyres — 16.9%
2014	15	82.4%	74	73,958	Lamps, Reflectors and Electrical Equipment — 23.0%
2015	16	85.7%	70	76,691	Lamps, Reflectors and Electrical Equipment — 24.3%
2016	17	76.8%	69	74,765	Brakes — 36.2%
2017	18	69.0%	58	75,845	Lamps, Reflectors and Electrical Equipment — 36.2%
2018	19	83.7%	43	82,594	Tyres — 14.0%
2019	20	81.4%	43	80,303	Lamps, reflectors and electrical equipment — 20.9%
2020	21	79.5%	44	76,465	Tyres — 18.2%

Common MOT Failures

Top failure categories across all test years for 1999 Mercedes Sl 500, with age trends.

Lamps, Reflectors and Electrical Equipment

18.8%

↑ Increases with age

Lamps, reflectors and electrical equipment

16.1%

↑ Increases with age

Brakes

12.0%

— Consistent

Tyres

10.9%

↑ Increases with age

Suspension

10.3%

— Consistent

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Tyres	6.5% (10 yrs)	18.2% (21 yrs)	+11.7%	🔴 ↑
Brakes	7.8% (10 yrs)	6.8% (21 yrs)	-1.0%	⚪ —

Other Manufacture Years

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

About This Data

This page shows how Mercedes Sl 500 cars manufactured in 1999 perform at MOT as they age. Data spans from 2009 to 2020, covering 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.