Should I check the MOT history before buying a 2009 Mercedes Benz Sl?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2009 Mercedes Benz Sl?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2009 Mercedes Benz Sl?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

How many 2009 Mercedes Benz Sl vehicles have had dangerous defects recorded?

32% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 2009 Mercedes Benz Sl reliable?

Based on MOT data from 591 vehicles, the 2009 Mercedes Benz Sl has a first-time MOT pass rate of 86.9%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2009 Mercedes Benz Sl?

The most frequently recorded MOT issues on the 2009 Mercedes Benz Sl are: Under-trays fitted obscuring some underside components (48.8% of vehicles), Engine covers fitted obscuring some components in the engine bay (34.7% of vehicles), Front Brake pad(s) wearing thin (34.2% of vehicles). These figures are based on actual MOT test records — search a specific registration on CarHunch to see its individual history.

Do I need an HPI check when buying a 2009 Mercedes Benz Sl?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Mercedes Benz Sl (2009)

591 real MOT outcomes analysed • 86.9% first-time pass rate

2009 Mercedes Benz Sl

CarHunch analysed 591 real MOT records for the 2009 Mercedes Benz Sl. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Common Issues Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2009 Mercedes-Benz SL passes its MOT first time in 86.9% of cases, comfortably ahead of the UK average of 80%—but one in three of these cars have experienced a dangerous defect at some point, which is a significant concern for a used buyer. This suggests mechanically sound examples exist, but you're taking on meaningful risk if you don't get a thorough pre-purchase inspection.

At 43,380 miles on average, these SLs are relatively low-mileage for their age, yet they rack up 2 failures and 11 advisories per test on average. The high advisory count points to trim and minor wear items rather than structural problems, but budget for regular maintenance on a luxury convertible of this age and watch for the electrical and hydraulic gremlins these models are prone to developing.

The 2009 Mercedes Benz Sl has a decent first-time pass rate (86.9%), but a higher-than-average share of vehicles have had serious defects recorded — the individual vehicle's history matters a lot here.

⚠️ Over 1 in 5 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

86.9%

UK average ~80%

Around average

Dangerous (ever)

32.2%

At least once in MOT history

Check this vehicle

Avg failures / car

2.01

Over 14.1 tests on record

High

Typical mileage

42k

Middle half: 28k–55k

For context

✅ Good baseline reliability. A 86.9% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔧 Expect consumable spend. An average of 11 advisories per vehicle tells you wear items (tyres, brakes) get flagged regularly. Budget for them — they're not surprises.

🔍 The dangerous defect figure is real. Most are one-off tyre failures or brake issues — not structural problems. But it's exactly why checking the individual vehicle's history is essential, not optional.

These stats describe 591 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Watch for defects — worth knowing

What tends to go wrong

Across 591 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Other issues 48.8%

Under-trays fitted obscuring some underside components · Engine covers fitted obscuring some components in the engine bay · Oil leak, but not excessive

Brake wear 34.2%

Front Brake pad(s) wearing thin · Offside Front Brake pipe corroded, covered in grease or other material · Nearside Front Brake pipe corroded, covered in grease or other material · …

Ask the seller when brakes were last serviced. If they don't know, factor in the cost.

Tyre wear 33%

Offside Rear Tyre worn close to the legal limit · Nearside Rear Tyre worn close to the legal limit · Nearside Rear Tyre worn close to legal limit/worn on edge · …

Budget for a full set — on a vehicle this age, tyres are expected consumables. An inspection will confirm how much is left.

Data covers a 3-year window centred on 2009.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 591 Mercedes Benz Sl cars.

Before you buy a 2009 Mercedes Benz Sl

Based on MOT data from 591 vehicles — here's what to check.

📋 Check the full MOT history. 32.2% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (99%)	587	86.9%	2.01

Colour Breakdown

Based on 34,567 Mercedes Benz Sl vehicles registered in the UK — across all years. From DVLA registration records.

Silver 33.9%

11,735

Black 24.1%

8,343

Blue 17.8%

6,160

Red 8.5%

2,946

White 6.2%

2,160

Grey 3.7%

1,270

Green 3.5%

1,202

Gold 1%

341

Brown 0.4%

125

Cream 0.3%

106

Beige 0.3%

104

Yellow 0.2%

Mileage Distribution

Most 2009 Mercedes Benz Sl vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

42,266

typical

27,811

low mileage

55,061

high mileage

Half of all 2009 Mercedes Benz Sl vehicles fall between 27,811 and 55,061 miles.

Is the mileage you're seeing normal?

✓ Under 27,811 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 27,811–55,061 miles — normal for age. This is where most 2009 Mercedes Benz Sls sit.

⚠ Over 74,332 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2009 Mercedes Benz Sl — Still on the Road

Most 2009 Mercedes Benz Sls are still being driven.

Strong survival — 444 vehicles still getting MOTs in 2025, 84% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.

MOT History Averages

14.1

Avg MOT tests per vehicle

2.01

Avg failures per vehicle

Avg advisories per vehicle

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Watch for defects — worth knowing