Mercedes Benz Sl car check
Find out if a Mercedes Benz Sl has outstanding finance, has been written off or stolen, how many owners it’s had, and which known problems apply to the generation you’re looking at.
Finance, stolen, write-off and owner history data provided by Experian. Results in under a minute.
- Typical price
- £24,57783 at dealers
- MOT failure rate
- 14.7%83k tests
- Known problems
- 5across R107 to R231
- Full report
- £7.49one-off, no subscription
Which Sl are you looking at?
Each Sl generation has its own weak spots. Pick the one you’re viewing to see what to check.
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Flexible brake hose deterioration
Safety risk R129, R230Flexible brake hoses on SL models deteriorate at 24.3 times the national fleet average, with failures documented across all mileage ranges from 20,000 miles upward. The flexible sections connecting the brake calipers to the rigid brake lines are subject to heat cycling from the brakes and movement from suspension travel. Age-related rubber degradation causes internal delamination and external cracking, potentially leading to brake fluid loss and brake failure. This is classified as dangerous due to the direct safety implications.
What to check: Inspect all visible flexible brake hoses at each wheel for cracks, bulging, or wet brake fluid stains. Check brake fluid level in the master cylinder reservoir - a dropping level may indicate hose leakage. Look for brake fluid staining on the inner wheel rim or around brake calipers. Gently flex ...
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Structural corrosion affecting rigidity
Safety risk R230This typically manifests as corrosion to the rear subframe mounting points, front suspension mounting areas, and sill structures that support the convertible top mechanism. The aluminium-steel construction creates galvanic corrosion issues where dissimilar metals meet. Once structural rigidity is compromised, the convertible body experiences increased flex which accelerates further deterioration and affects occupant safety in a collision.
What to check: Inspect the rear wheel arches from inside the boot, looking for rust bubbling through paint or visible corrosion around suspension mounting points. Check the front and rear jacking points for corrosion or previous repair work - these are critical structural areas. Look under the car at sill struc...
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Steering box oil leakage
Wear item R129The recirculating ball steering box on R129 5.0-litre models develops internal seal failure, allowing power steering fluid to leak from the box housing onto the road surface. The steering box is a sealed unit requiring complete replacement rather than rebuild, making this an expensive repair. Later R230 models use rack-and-pinion steering which is not subject to this specific failure mode.
What to check: Check the ground under the front centre of the car for fresh oil stains - power steering fluid is typically red or amber coloured and has a distinctive sweet smell. Inspect the steering box housing visible behind the front wheels for wet oil deposits or staining. Check the power steering fluid re...
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Suspension joint dust cover deterioration
Wear item R129, R230The rubber dust covers protecting ball joints and suspension bushes deteriorate rapidly on SL models, failing at 52 times the national fleet average according to MOT data. Once the protective cover splits, dirt and moisture enter the joint causing accelerated wear and eventual failure. This affects multiple suspension components simultaneously across front and rear suspension systems. The combination of age-related rubber degradation and the convertible body structure's increased chassis flex accelerates this deterioration.
What to check: Inspect all visible rubber boots around the front wheel area for splits, tears, or obvious deterioration - these protect the ball joints and track rod ends. Check the rear suspension area for damaged dust covers on trailing arm bushes and shock absorber mounts. Look for grease staining around sus...
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Wheel bearing excessive play
Wear item R129, R230Wheel bearings on SL models fail at 21.7 times the national fleet average, with peak failure rates on 2.8-litre variants in the 40,000-60,000 mile range. The combination of the car's weight, performance driving patterns, and age-related seal deterioration leads to premature bearing wear. Front bearings typically fail first due to steering loads and braking forces. A failed wheel bearing creates dangerous handling characteristics and can lead to wheel detachment if ignored.
What to check: Jack up each wheel individually and attempt to rock it vertically and horizontally - any movement indicates bearing wear. Spin each wheel by hand and listen for grinding, rumbling, or rough rotation. Check for heat build-up on wheel centres after a drive - excessively hot wheels indicate bearing ...
We haven’t flagged any common problems for this generation in our data yet. A history check still tells you about finance, write-offs and theft, and the MOT history shows how this particular car has been looked after.
What Sls cost at dealers now
From 83 used Sls we track on UK dealer websites.
- Typical asking price
- £24,577
- Typical mileage
- 57,007 miles
- Price change vs last month
- -24.8%
Sl MOT results
of Sl MOT tests end in a fail, from 82,701 tests.
Most common reasons for failing
- Steering rack wearSteering
- Track rod ends wornSteering
- Suspension pin, bush or joint wornSuspension
Check the Sl you’re buying
One report covers outstanding finance, write-offs, theft and previous owners from Experian, plus MOT history, mileage and the known problems for its generation.
Finance, stolen, write-off and owner history data provided by Experian.
What the check includes
- Outstanding finance Experian
- Write-off status Experian
- Stolen vehicle check Experian
- Previous owners and keeper history Experian
- MOT history and advisories DVSA
- Mileage check DVSA
- Known problems for its generation GetCarWise
- How many are left on the road DVLA
Sl questions
Is the Mercedes Benz Sl reliable?
14.7% of Sl models fail their MOT based on 82,701 tests analysed. That’s better than average for the class. There are 5 known problems to watch for, the most serious being flexible brake hose deterioration. A full history check shows whether a specific car has had related write-offs or insurance claims.
What are the main problems with a Mercedes Benz Sl?
The most serious known issues are flexible brake hose deterioration, structural corrosion affecting rigidity, steering box oil leakage. Problems vary by generation, so check which apply to the year you’re looking at. Our car check flags whether a specific Sl has been written off or had insurance claims linked to these faults.
How do I check if a Mercedes Benz Sl has outstanding finance?
Enter the registration on this page. We query Experian’s finance database and return any outstanding agreements within a minute. If finance is still owed, the finance company can legally repossess the car even after you’ve paid the seller. At £7.49 it’s the cheapest way to avoid a car that isn’t legally for sale.
How do I check if a Mercedes Benz Sl has been written off?
Our check queries Experian’s insurance write-off database for Cat A, B, S and N markers. A Cat S or N Sl has been structurally or non-structurally damaged and repaired. This doesn’t mean it’s unsafe, but it affects resale value and some insurers won’t cover it. The check costs £7.49.
Can I check a Mercedes Benz Sl for free?
You can check MOT history free on GOV.UK, which shows past test results and advisories. What it won’t show is outstanding finance, write-offs or theft markers, which are the things that actually cost you money after you’ve bought. Our full check adds all of that for £7.49, using Experian data.
Is a Mercedes Benz Sl HPI check worth it?
HPI is one brand of car check. Our check uses the same Experian data covering finance, stolen, write-off and keeper history, plus MOT analysis and known Sl faults that HPI doesn’t include. At £7.49 it’s typically less than half the price of an HPI check.
What does a Mercedes Benz Sl fail its MOT on?
The most common MOT failure on the Sl is steering rack wear. 14.7% of Sl models fail overall, based on 82,701 tests. Checking a car’s full MOT history before buying shows you recurring problems the seller might not mention.
More on the Sl
Other Mercedes Benz car checks
Finance, stolen, write-off and owner history data provided by Experian. MOT data from DVSA. Known problems from GetCarWise analysis. Updated October 2026.