How much does a 1991 PORSCHE 928 cost to run?

Estimated annual running cost is £2,907 (£242/month), including £1592 fuel, £760 road tax, £55 MOT, and £500 predicted repairs.

What is the MOT pass rate for a 1991 PORSCHE 928?

The 1991 PORSCHE 928 has a 76% MOT pass rate based on 42 tests in 2026. This ranks 120 out of 179 cars from 1991.

Which year PORSCHE 928 is most reliable?

The 1993 PORSCHE 928 has the highest MOT pass rate at 96%. The least reliable year is 1995 at 80%.

PORSCHE 928 (1991)

Q: Is the 1991 PORSCHE 928 reliable?

Average reliability. Expect some repairs as it ages. 76% of PORSCHE 928s from 1991 passed their MOT first time in 2026, based on 42 tests. That's 6 points below the national average of 82%.

Q: What is the average mileage for a 1991 PORSCHE 928?

The average mileage for a 1991 PORSCHE 928 is 127,119 miles, which is significantly below the expected 259,000 miles for a 35-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 42 real MOT tests.

Annual Cost

£2,907

£242/month

MOT Pass Rate

76%

Average

Road Tax

£760

Based on CC/year

Insurance

Grp 35-50

4957cc Petrol

Check Carefully

76% pass rate, £2907/year to run. 6 points below average.

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Petrol4957cc35 years old42 tests127k miles avg

Annual Running Costs

Fuel (Petrol, 4957cc)

~30 mpg

£1,592

Road Tax

Based on 4957cc

£760

MOT Test

£55

Predicted Repairs

£500

Total per year£2,907

Per month£242/mo

Per week£56/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

76% MOT pass rate(Average)

0%National avg: 82%100%

Average reliability. Expect some repairs as it ages. That's 6 points below the national average of 82%. It falls below the PORSCHE brand average of 92%.

At 35 years old, 76% of PORSCHE 928s from 1991 passed their MOT first time in 2026. That's based on 42 tests across the UK. The average mileage at this age is 127,119 miles.

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How Does It Compare?

Rank among 1991 cars120th of 179(top 67%)

Rank among PORSCHE models272th of 276(top 99%)

vs national average-6%(82% avg)

vs 1991 cars average-2%(78% avg)

vs PORSCHE average-16%(92% avg)

Mileage Analysis

127,119

Average miles

259,000

Expected for age

The average 1991 PORSCHE 928 has 127,119 miles on the clock, which is significantly below the expected 259,000 miles for a 35-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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Best Year to Buy?

The most reliable year is the 1993 model with a 96% MOT pass rate, while the 1995 model has the lowest at 80%. The 1991 sits between the two at 76%.

PORSCHE 928 by Year

Year	Pass Rate	Tests	Avg Mileage
1995	80%	153	68,198 mi
1994	91%	79	81,080 mi
1993	96%	50	102,665 mi
1992	90%	41	101,109 mi
1991	76%	42	127,119 mi
1990	88%	52	97,889 mi

Similar Cars to Consider

JAGUAR XJS

1990 · 5343cc Petrol

£2,247/year

82%

+6%

MERCEDES 500

1991 · 4973cc Petrol

£2,247/year

87%

+11%

MERCEDES SL

1991 · 4973cc Petrol

£2,247/year

86%

+10%

JAGUAR XJ

1990 · 5345cc Petrol

£2,247/year

86%

+10%

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About the 1991 PORSCHE 928

The 1991 PORSCHE 928 is a luxury with a 4957cc petrol engine. 42 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 1991, the average MOT pass rate is 78%, and this model falls short of that benchmark.

With an average of 127,119 miles at 35 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.

1991 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 1991 PORSCHE 928?

Total estimated annual running cost is £2,907 (£242/month), broken down as £1592 fuel, £760 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 76% 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 1991 PORSCHE 928

At 35 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 42 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

Based on the 1991 PORSCHE 928's fuel type, age, and engine size, these are the most likely problem areas to check.

Timing Chain / Belt

Watch out

At 35 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 127k 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.

Engine Mounts

Medium risk

Worn engine mounts cause excessive vibration and movement. Replacement costs £150-£400 per mount. Check for vibration at idle with the bonnet open.

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 1991 PORSCHE 928 stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
PORSCHE 928(1991)	76%	£1592	£760	Grp 35-50	£2907
JAGUAR XJS(1990)	82%	£1592	£250	Grp 35-50	£2247-£660
MERCEDES 500(1991)	87%	£1592	£250	Grp 35-50	£2247-£660
MERCEDES SL(1991)	86%	£1592	£250	Grp 35-50	£2247-£660
JAGUAR XJ(1990)	86%	£1592	£250	Grp 35-50	£2247-£660

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.