Porsche 928
Reliability, running costs, and MOT data across 6 years from 417 real MOT tests.
Avg Pass Rate
87%
Total Tests
417
Best Year
1993 (96%)
Years Covered
6
How reliable is the Porsche 928?
Porsche 928 by Year
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About the Porsche 928
The Porsche 928 has been tested 417 times in 2024 MOT data across 6 model years (1990 to 1995), with an average pass rate of 87%. That's slightly above the national average of 82%. Available as petrol.
Best and Worst Years
The 1993 model is the most reliable with a 96% pass rate from 50 tests. The 1991 model has the lowest at 76%. With a 20 point spread, choosing the right year makes a big difference to reliability.
Reliability Trend
Older PORSCHE 928s tend to have better MOT pass rates than newer ones, with an average decline of 7 percentage points across model years.
Mileage Across Years
The oldest model in our data (1990) averages 97,889 miles, while the newest (1995) averages 68,198 miles.
Compared to the Porsche brand average of 92%, the 928 is 5 points lower, placing it among the less reliable Porsche models.
Click any year in the table above to see detailed running costs, individual reliability data, and comparisons with similar cars.