How much does a 1990 PORSCHE 928 S cost to run?

Estimated annual running cost is £2,757 (£230/month), including £1592 fuel, £760 road tax, £55 MOT, and £350 predicted repairs.

What is the MOT pass rate for a 1990 PORSCHE 928 S?

The 1990 PORSCHE 928 S has a 84% MOT pass rate based on 125 tests in 2026. This ranks 59 out of 190 cars from 1990.

Which year PORSCHE 928 S is most reliable?

The 1990 PORSCHE 928 S has the highest MOT pass rate at 84%. The least reliable year is 1992 at 72%.

PORSCHE 928 S (1990)

Q: Is the 1990 PORSCHE 928 S reliable?

Good reliability. Occasional issues but generally solid. 84% of PORSCHE 928 Ss from 1990 passed their MOT first time in 2026, based on 125 tests. That's 2 points above the national average of 82%.

Q: What is the average mileage for a 1990 PORSCHE 928 S?

The average mileage for a 1990 PORSCHE 928 S is 115,960 miles, which is significantly below the expected 266,400 miles for a 36-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.

Running costs, reliability data, and common problems from 125 real MOT tests.

Annual Cost

£2,757

£230/month

MOT Pass Rate

84%

Good

Road Tax

£760

Based on CC/year

Insurance

Grp 35-50

4957cc Petrol

Solid Option

84% pass rate, £2757/year to run. Close to the national average.

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Petrol4957cc36 years old125 tests116k miles avg

Annual Running Costs

Fuel (Petrol, 4957cc)

~30 mpg

£1,592

Road Tax

Based on 4957cc

£760

MOT Test

£55

Predicted Repairs

£350

Total per year£2,757

Per month£230/mo

Per week£53/wk

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.

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Reliability Verdict

84% MOT pass rate(Good)

0%National avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It falls below the PORSCHE brand average of 92%.

At 36 years old, 84% of PORSCHE 928 Ss from 1990 passed their MOT first time in 2026. That's based on 125 tests across the UK. The average mileage at this age is 115,960 miles.

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How Does It Compare?

Rank among 1990 cars59th of 190(top 31%)

Rank among PORSCHE models246th of 276(top 89%)

vs national average+2%(82% avg)

vs 1990 cars average+5%(79% avg)

vs PORSCHE average-8%(92% avg)

Mileage Analysis

115,960

Average miles

266,400

Expected for age

The average 1990 PORSCHE 928 S has 115,960 miles on the clock, which is significantly below the expected 266,400 miles for a 36-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.

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PORSCHE 928 S by Year

Year	Pass Rate	Tests	Avg Mileage
1992	72%	58	118,583 mi
1991	81%	181	114,141 mi
1990	84%	125	115,960 mi

Similar Cars to Consider

JAGUAR XJS

1990 · 5343cc Petrol

£2,247/year

82%

-2%

MERCEDES 500

1991 · 4973cc Petrol

£2,247/year

87%

+3%

MERCEDES SL

1991 · 4973cc Petrol

£2,247/year

86%

+2%

JAGUAR XJ

1990 · 5345cc Petrol

£2,247/year

86%

+2%

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About the 1990 PORSCHE 928 S

The 1990 PORSCHE 928 S is a luxury with a 4957cc petrol engine. 125 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 1990, the average MOT pass rate is 79%, and this model beats that benchmark.

With an average of 115,960 miles at 36 years old, PORSCHE 928 S 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 S 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 S?

Total estimated annual running cost is £2,757 (£230/month), broken down as £1592 fuel, £760 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 84% pass rate. Keeping on top of servicing will help avoid surprises.

PORSCHE 928 S Reliability Trend

Older PORSCHE 928 Ss tend to have better MOT pass rates than newer ones, with an average decline of 8 percentage points across model years.

Buying a Used 1990 PORSCHE 928 S

At 36 years old, the PORSCHE 928 S 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.

Common Issues to Watch For

Based on the 1990 PORSCHE 928 S's fuel type, age, and engine size, these are the most likely problem areas to check.

Timing Chain / Belt

Watch out

At 36 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.

Oil Consumption

Medium risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

Clutch Wear

Watch out

With an average of 116k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.

Brake Discs and Pads

Medium risk

High-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 1990 PORSCHE 928 S stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
PORSCHE 928 S(1990)	84%	£1592	£760	Grp 35-50	£2757
JAGUAR XJS(1990)	82%	£1592	£250	Grp 35-50	£2247-£510
MERCEDES 500(1991)	87%	£1592	£250	Grp 35-50	£2247-£510
MERCEDES SL(1991)	86%	£1592	£250	Grp 35-50	£2247-£510
JAGUAR XJ(1990)	86%	£1592	£250	Grp 35-50	£2247-£510

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.