Mercedes Benz Sl (1980)
1980 Mercedes Benz Sl
CarHunch analysed 246 real MOT records for the 1980 Mercedes Benz Sl. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 1980 Mercedes-Benz SL's 72.9% first-time pass rate sits noticeably below the UK average of 80%, signalling that these cars demand more attention to keep road-legal. With 13% of vehicles having recorded dangerous defects at some point, buyers should factor in the cost of thorough pre-purchase inspection and potentially ongoing remedial work.
These SLs are averaging just over 92,000 miles, a reasonable figure for 40+ year old cars, yet they're still accumulating an average of 2.83 failures and 9.5 advisories per test cycle—suggesting age-related wear and deferred maintenance are the norm rather than the exception. Before committing to ownership, get a full mechanical inspection by a Mercedes specialist, because routine issues on a classic of this age can quickly spiral into expensive surprises.
What to check before buying a 1980 Mercedes Benz Sl
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Mercedes Benz Sl
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Mileage Distribution
Most 1980 Mercedes Benz Sl vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 1980 Mercedes Benz Sl vehicles fall between 69,702 and 114,117 miles.
1980 Mercedes Benz Sl — Still on the Road
Numbers are declining — 19 vehicles still getting MOTs in 2025 (17% of peak).
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
MOT History Averages
Most Common MOT Issues — 1980 Mercedes Benz Sl
Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.
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40.7%
Oil leak
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23.5%
Exhaust has a minor leak of exhaust gases
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22%
Steering system has slight free play detected at steering wheel
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21.2%
Exhaust emissions carbon monoxide content excessive
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20.3%
Nearside Rear Suspension component mounting prescribed area is excessively corroded
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19.5%
Offside Rear Suspension component mounting prescribed area is excessively corroded
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19%
Offside Headlamp aim too low
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17.5%
Oil leak, but not excessive
Data covers a 3-year window centred on 1980. Counts include advisories and failures.
Found a specific Mercedes Benz Sl?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.