Should I check the MOT history before buying a 1999 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 1999 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 1999 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 1999 Mercedes Benz Sl vehicles have had dangerous defects recorded?

22% 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 1999 Mercedes Benz Sl reliable?

Based on MOT data from 933 vehicles, the 1999 Mercedes Benz Sl has a first-time MOT pass rate of 84%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 1999 Mercedes Benz Sl?

The most frequently recorded MOT issues on the 1999 Mercedes Benz Sl are: Nearside Rear Tyre worn close to the legal limit (60% of vehicles), Offside Rear Tyre worn close to the legal limit (56.4% of vehicles), Nearside Front Tyre worn close to the legal limit (41.6% 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 1999 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 (1999)

933 real MOT outcomes analysed • 84% first-time pass rate

1999 Mercedes Benz Sl

CarHunch analysed 933 real MOT records for the 1999 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

This 1999 Mercedes-Benz SL passes its MOT slightly above the UK average at 84%, which is a decent result for a 25-year-old car—but one in five fails, and 22.4% have experienced dangerous defects, making thorough pre-purchase inspection essential. The concerning advisory rate of 20.4 per vehicle suggests these cars need regular attention to smaller wear items and maintenance.

With a median mileage of just under 68,000 miles, these SLs are genuinely well-preserved examples, yet they still average 2.92 failures per test, pointing to age-related wear rather than abuse or poor maintenance. If you're considering one, budget for an independent pre-purchase inspection that specifically covers the electrical and hydraulic systems where these cars typically develop issues.

The 1999 Mercedes Benz Sl passes its MOT first time at roughly the UK average rate (84%) — solid but worth checking this vehicle's history carefully.

⚠️ 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

84%

UK average ~80%

Around average

Dangerous (ever)

22.4%

At least once in MOT history

Check this vehicle

Avg failures / car

2.92

Over 17.6 tests on record

High

Typical mileage

68k

Middle half: 49k–87k

For context

🔧 Average reliability. Passes at roughly the UK rate — not a standout, not a problem vehicle. Individual history makes all the difference.

🔧 Expect consumable spend. An average of 20.4 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 933 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.

Average reliability — agree?

What tends to go wrong

Across 933 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 60%

Nearside Rear Tyre worn close to the legal limit · Offside Rear Tyre worn close to the legal limit · Nearside Front Tyre worn close to the legal limit · …

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

Other issues 38.6%

Oil leak, but not excessive · Oil leak · Under-trays fitted obscuring some underside components

Suspension & steering 31.1%

Nearside Front wheel bearing has slight play · Offside Front wheel bearing has slight play

Harder to spot without a ramp — this is a good reason to book a pre-purchase inspection.

Brake wear 30%

Front Brake pad(s) wearing thin · Offside Rear Brake pipe slightly corroded · Offside Rear Brake hose slightly deteriorated · …

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

Data covers a 3-year window centred on 1999.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 933 Mercedes Benz Sl cars.

Before you buy a 1999 Mercedes Benz Sl

Based on MOT data from 933 vehicles — here's what to check.

📋 Check the full MOT history. 22.4% 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 (100%)	932	84%	2.92

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 1999 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.

67,862

typical

48,807

low mileage

87,184

high mileage

Half of all 1999 Mercedes Benz Sl vehicles fall between 48,807 and 87,184 miles.

Is the mileage you're seeing normal?

✓ Under 48,807 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.

✓ 48,807–87,184 miles — normal for age. This is where most 1999 Mercedes Benz Sls sit.

⚠ Over 117,698 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

1999 Mercedes Benz Sl — Still on the Road

Most 1999 Mercedes Benz Sls are still being driven.

504 vehicles still getting MOTs in 2025 — 72% of the peak remain.

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

17.6

Avg MOT tests per vehicle

2.92

Avg failures per vehicle

20.4

Avg advisories per vehicle

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Average reliability — agree?