1999 Mercedes Sl 320 — MOT History by Age

How cars manufactured in 1999 perform at MOT as they age

27 years

Current Age

79.1%

Latest Pass Rate

4,930

Total Tests (All Years)

80,509 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 320 as it ages.

10 yrs78.7%

→ ↑1.3%

11 yrs80.0%

→ ↓0.4%

12 yrs79.6%

→ ↓1.2%

13 yrs78.4%

→ ↑0.7%

14 yrs79.1%

→ ↑3.2%

15 yrs82.3%

→ ↑1.7%

16 yrs84.0%

→ ↓5.8%

17 yrs78.2%

→ ↓2.2%

18 yrs76.0%

→ ↑5.6%

19 yrs81.6%

→ ↓8.1%

20 yrs73.5%

→ ↑5.6%

21 yrs79.1%

📊 View as table

Age	Pass Rate	Tests
10 yrs	78.7%	503
11 yrs	80.0%	475
12 yrs	79.6%	496
13 yrs	78.4%	482
14 yrs	79.1%	455
15 yrs	82.3%	452
16 yrs	84.0%	432
17 yrs	78.2%	435
18 yrs	76.0%	383
19 yrs	81.6%	256
20 yrs	73.5%	298
21 yrs	79.1%	263

Pass Rate Trend

How the 1999 Mercedes Sl 320 pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2020 (21 yrs)	79.1%	263
2019 (20 yrs)	73.5%	298
2018 (19 yrs)	81.6%	256
2017 (18 yrs)	76%	383
2016 (17 yrs)	78.2%	435
2015 (16 yrs)	84%	432
2014 (15 yrs)	82.3%	452
2013 (14 yrs)	79.1%	455
2012 (13 yrs)	78.4%	482
2011 (12 yrs)	79.6%	496
2010 (11 yrs)	80%	475
2009 (10 yrs)	78.7%	503

Year-by-Year MOT Results

2009

78.7%

Age (yrs) 10Tests 503Avg Mileage 60,413Top Failure Lamps, Reflectors and Electrical Equipment — 10.9%

2010

80.0%

Age (yrs) 11Tests 475Avg Mileage 62,730Top Failure Tyres — 9.5%

2011

79.6%

Age (yrs) 12Tests 496Avg Mileage 65,769Top Failure Lamps, Reflectors and Electrical Equipment — 12.1%

2012

78.4%

Age (yrs) 13Tests 482Avg Mileage 68,402Top Failure Lamps, Reflectors and Electrical Equipment — 12.4%

2013

79.1%

Age (yrs) 14Tests 455Avg Mileage 71,301Top Failure Lamps, Reflectors and Electrical Equipment — 23.5%

2014

82.3%

Age (yrs) 15Tests 452Avg Mileage 74,407Top Failure Lamps, Reflectors and Electrical Equipment — 16.8%

2015

84.0%

Age (yrs) 16Tests 432Avg Mileage 75,649Top Failure Lamps, Reflectors and Electrical Equipment — 17.4%

2016

78.2%

Age (yrs) 17Tests 435Avg Mileage 76,518Top Failure Brakes — 23.2%

2017

76.0%

Age (yrs) 18Tests 383Avg Mileage 77,051Top Failure Brakes — 30.5%

2018

81.6%

Age (yrs) 19Tests 256Avg Mileage 79,827Top Failure Suspension — 20.7%

2019

73.5%

Age (yrs) 20Tests 298Avg Mileage 79,245Top Failure Lamps, reflectors and electrical equipment — 29.5%

2020

79.1%

Age (yrs) 21Tests 263Avg Mileage 80,509Top Failure Brakes — 23.6%

MOT results for 1999 Mercedes Sl 320 by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	10	78.7%	503	60,413	Lamps, Reflectors and Electrical Equipment — 10.9%
2010	11	80.0%	475	62,730	Tyres — 9.5%
2011	12	79.6%	496	65,769	Lamps, Reflectors and Electrical Equipment — 12.1%
2012	13	78.4%	482	68,402	Lamps, Reflectors and Electrical Equipment — 12.4%
2013	14	79.1%	455	71,301	Lamps, Reflectors and Electrical Equipment — 23.5%
2014	15	82.3%	452	74,407	Lamps, Reflectors and Electrical Equipment — 16.8%
2015	16	84.0%	432	75,649	Lamps, Reflectors and Electrical Equipment — 17.4%
2016	17	78.2%	435	76,518	Brakes — 23.2%
2017	18	76.0%	383	77,051	Brakes — 30.5%
2018	19	81.6%	256	79,827	Suspension — 20.7%
2019	20	73.5%	298	79,245	Lamps, reflectors and electrical equipment — 29.5%
2020	21	79.1%	263	80,509	Brakes — 23.6%

Common MOT Failures

Top failure categories across all test years for 1999 Mercedes Sl 320, with age trends.

Lamps, reflectors and electrical equipment

16.9%

↑ Increases with age

Brakes

16.8%

↑ Increases with age

Lamps, Reflectors and Electrical Equipment

15.1%

↑ Increases with age

Suspension

11.4%

↑ Increases with age

Tyres

11.1%

↑ 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
Brakes	8.7% (10 yrs)	23.6% (21 yrs)	+14.9%	🔴 ↑
Suspension	4.2% (10 yrs)	16.3% (21 yrs)	+12.1%	🔴 ↑
Tyres	8.5% (10 yrs)	17.1% (21 yrs)	+8.6%	🔴 ↑

Other Manufacture Years

1993 1994 1995 1996 1997 1998 1999 2000 2001

← Back to Mercedes Sl 320 overview

Looking for the best year to buy? See the full comparison on the Mercedes Sl 320 page →

About This Data

This page shows how Mercedes Sl 320 cars manufactured in 1999 perform at MOT as they age. Data spans from 2009 to 2020, covering 4,930 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.