Mercedes Benz 500 (1986)
1986 Mercedes Benz 500
CarHunch analysed 280 real MOT records for the 1986 Mercedes Benz 500. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 1986 Mercedes-Benz 500 passes its MOT first time just 73.6% of the time, trailing the UK average by 6.4 percentage points—a meaningful gap that reflects the challenges of maintaining a nearly 40-year-old luxury car. More concerning, over one in five of these vehicles (21.1%) have been flagged for dangerous defects during testing, suggesting structural or safety issues that go beyond typical wear.
These cars are averaging 121,407 miles, which is reasonable for their age, but they're racking up 2.74 failures per test and nearly 10 advisories each, painting a picture of a vehicle that demands serious mechanical attention. If you're considering one, budget for a full pre-purchase inspection by a Mercedes specialist—the high failure rate and dangerous defect prevalence mean a cheap purchase price will almost certainly be offset by repair costs.
What to check before buying a 1986 Mercedes Benz 500
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.
- ⚠️ 21.1% of these vehicles have had a dangerous defect recorded. Enter the reg below — the full MOT history will show exactly what was flagged and whether it was resolved.
- 📄 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 500
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (99%) | 276 | 73.6% | 2.75 |
| LPG (1%) | 3 | 66.7% | 2.33 |
| Diesel (0%) | 1 | 83.3% | 1 |
Mileage Distribution
Most 1986 Mercedes Benz 500 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 1986 Mercedes Benz 500 vehicles fall between 89,687 and 146,452 miles.
1986 Mercedes Benz 500 — Still on the Road
63 vehicles still getting MOTs in 2025 — 62% 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.
MOT History Averages
Most Common MOT Issues — 1986 Mercedes Benz 500
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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46.2%
Oil leak
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27.2%
Oil leak, but not excessive
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22.1%
Offside Front Tyre worn close to the legal limit
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19.6%
Exhaust emissions carbon monoxide content excessive
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19%
Nearside Rear Tyre worn close to the legal limit
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19%
Offside Rear Tyre worn close to the legal limit
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18.5%
Nearside Front Tyre worn close to the legal limit
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18%
Steering system has slight free play detected at steering wheel
Data covers a 3-year window centred on 1986. Counts include advisories and failures.
Found a specific Mercedes Benz 500?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.