Porsche 928 S (1989)
1989 Porsche 928 S
CarHunch analysed 210 real MOT records for the 1989 Porsche 928 S. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 1989 Porsche 928 S falls slightly short of the UK average with a 75.6% pass rate, and a concerning 21.4% of these cars have recorded dangerous defects—a red flag for any potential buyer. The petrol-only powertrain means there's no diesel alternative to consider, so reliability hinges entirely on the condition of this aging sports car's engine and systems.
At nearly 113,000 miles on average, these vehicles are well-used, yet they still rack up 3.06 failures and 14.1 advisories per test—suggesting either deferred maintenance or inherent wear patterns that owners should budget for. Before purchasing, insist on a pre-purchase inspection by a Porsche specialist, as the high advisory count indicates routine wear items (seals, suspension, trim) are common expenses on this model.
What to check before buying a 1989 Porsche 928 S
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.
- ⚠️ 21.4% 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 Porsche 928 S
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Mileage Distribution
Most 1989 Porsche 928 S 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 Porsche 928 S vehicles fall between 92,972 and 133,984 miles.
1989 Porsche 928 S — Still on the Road
60 vehicles still getting MOTs in 2025 — 56% 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
Found a specific Porsche 928 S?
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