PORSCHE 928 (1990)
Running costs, common problems, and reliability data based on 52 real MOT tests in 2024.
MOT Pass Rate
88%
Total Tests (2024)
52
Avg Mileage
97,889 mi
Est. Annual Cost
£2,247
Is the 1990 PORSCHE 928 reliable?
Good reliability. Occasional issues but generally solid. That's 6 points above the national average of 82%. It falls below the PORSCHE brand average of 92%.
At 34 years old, 88% of PORSCHE 928s from 1990 passed their MOT first time in 2024. That's based on 52 tests across the UK. The average mileage at this age is 97,889 miles.
How does the 1990 PORSCHE 928 compare?
Mileage Analysis
The average 1990 PORSCHE 928 has 97,889 miles on the clock, which is significantly below the expected 251,600 miles for a 34-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.
Best year to buy a PORSCHE 928?
The most reliable year is the 1993 model with a 96% MOT pass rate, while the 1995 model has the lowest at 80%. The 1990 sits between the two at 88%.
How much does a 1990 PORSCHE 928 cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
PORSCHE 928 by Year
Checking a specific PORSCHE 928?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 1990 PORSCHE 928
The 1990 PORSCHE 928 is a luxury with a 4957cc petrol engine. 52 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It ranks in the top 16% of all 1990 cars for reliability.
With an average of 97,889 miles at 34 years old, PORSCHE 928 owners tend to use this car less than the typical driver. Very low mileage could mean the car has been garaged or used only for short trips, which can cause its own issues like battery drain and moisture buildup.
1990 PORSCHE 928 Fuel Costs
The 4957cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 1990 PORSCHE 928?
Total estimated annual running cost is £2,247 (£187/month), broken down as £1592 fuel, £250 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 88% pass rate. Keeping on top of servicing will help avoid surprises.
PORSCHE 928 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.
Buying a Used 1990 PORSCHE 928
At 34 years old, the PORSCHE 928 is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 1993 model has the highest pass rate at 96%. Note: with only 52 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 1990 PORSCHE 928
The PORSCHE 928 is actually the most reliable option among similar petrol luxurys from this era. Here are comparable petrol cars with similar engines:
- JAGUAR XJS (1990) 82% pass rate (-6%) from 1,011 tests
- MERCEDES 500 (1991) 87% pass rate (-1%) from 356 tests
- MERCEDES SL (1991) 86% pass rate (-2%) from 288 tests
- JAGUAR XJ (1990) 86% pass rate (-2%) from 282 tests