Porsche 928 S
Reliability, estimated running costs, and MOT data across 3 model years from 364 MOT tests in 2024.
Avg Pass Rate
79%
Total Tests
364
Highest Pass Rate
1990 (84%)
Years Covered
3
About the Porsche 928 S
The Porsche 928 S was MOT tested 364 times in 2024 (DVSA data, retests included) across 3 model years (1990 to 1992), with an average pass rate of 79%. That's close to the average of 82% across all models in our data. Our records list petrol versions.
Best and Worst Years
Of the years with at least 100 tests, the 1990 model has the highest pass rate at 84% from 125 tests. The 1991 model has the lowest at 81%. With just a 3 point gap, pass rates are similar across these years. Newer cars usually pass more often simply because they are younger.
Mileage Across Years
The oldest model in our data (1990) averages 115,960 miles, while the newest (1992) averages 118,583 miles. Older models have covered serious mileage, so suspension and drivetrain wear are worth checking.
Compared to the Porsche brand average of 92%, the 928 S is 13 points lower, placing it among the less reliable Porsche models.
Estimated Running Costs
Higher due to low pass rate
Based on 7,400 miles/year, average pump prices of 174.57p petrol and 199.33p diesel (GOV.UK weekly road fuel prices, week of 19 October 2026), and MOT pass rate data. Insurance not included.
Full 1992 detailsHow reliable is the Porsche 928 S?
Porsche 928 S by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
Questions about the Porsche 928 S
Is the Porsche 928 S reliable?
Across its 3 model years in our data (1990 to 1992), the Porsche 928 S averages a 79% MOT pass rate, from 364 tests (DVSA MOT data for tests in 2024, retests included). That's 3 points below the average of 82% across all models in the same data. The 1990 model has the highest pass rate of the years with at least 100 tests, at 84%.
Which year Porsche 928 S has the best MOT pass rate?
Of the years with at least 100 tests, the 1990 Porsche 928 S has the highest MOT pass rate at 84%, while the 1991 model has the lowest at 81%, a 3 point gap. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
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