Mercedes 300 D Diesel Auto (1989)
1989 Mercedes 300 D Diesel Auto
CarHunch analysed 180 real MOT records for the 1989 Mercedes 300 D Diesel Auto. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
**Reliability verdict:** This 1989 Mercedes 300D is essentially impossible to buy — only 1.1% of the 180 vehicles analysed passed their MOT, catastrophically below the UK average of 80%. With zero dangerous defects recorded and zero failures or advisories per vehicle on average, the numbers suggest these cars are simply too old and worn to test reliably rather than inherently unsafe.
**Practical takeaway:** The median mileage of 272,321 miles reflects a cohort of severely aged vehicles; at this mileage and era, these diesels have usually exhausted their practical lifespan. If you find one that has somehow passed MOT, treat it as a museum piece rather than transport — the 1.1% pass rate tells you everything about what's left in the market.
What to check before buying a 1989 Mercedes 300 D Diesel Auto
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 300 D Diesel Auto
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 |
|---|---|---|---|
| Diesel (99%) | 179 | 1.1% | 0 |
| Petrol (1%) | 1 | 0% | 0 |
Mileage Distribution
Most 1989 Mercedes 300 D Diesel Auto 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 1989 Mercedes 300 D Diesel Auto vehicles fall between 139,228 and 272,321 miles.
MOT History Averages
Found a specific Mercedes 300 D Diesel Auto?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.