How much does a 1991 BENTLEY EIGHT cost to run?

Estimated annual running cost is £2,607 (£217/month), including £1592 fuel, £760 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 1991 BENTLEY EIGHT?

The 1991 BENTLEY EIGHT has a 91% MOT pass rate based on 54 tests in 2026. This ranks 28 out of 179 cars from 1991.

Which year BENTLEY EIGHT is most reliable?

The 1992 BENTLEY EIGHT has the highest MOT pass rate at 100%. The least reliable year is 1990 at 66%.

BENTLEY EIGHT (1991)

Q: Is the 1991 BENTLEY EIGHT reliable?

Excellent reliability. Very few MOT failures. 91% of BENTLEY EIGHTs from 1991 passed their MOT first time in 2026, based on 54 tests. That's 9 points above the national average of 82%.

Q: What is the average mileage for a 1991 BENTLEY EIGHT?

The average mileage for a 1991 BENTLEY EIGHT is 65,593 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 54 real MOT tests.

Annual Cost

£2,607

£217/month

MOT Pass Rate

91%

Excellent

Road Tax

£760

Based on CC/year

Insurance

Grp 35-50

6750cc Petrol

Great Choice

91% pass rate, £2607/year to run. 9 points above average.

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Petrol6750cc35 years old54 tests66k miles avg

Annual Running Costs

Fuel (Petrol, 6750cc)

~30 mpg

£1,592

Road Tax

Based on 6750cc

£760

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,607

Per month£217/mo

Per week£50/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

91% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 9 points above the national average of 82%.

At 35 years old, 91% of BENTLEY EIGHTs from 1991 passed their MOT first time in 2026. That's based on 54 tests across the UK. The average mileage at this age is 65,593 miles.

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How Does It Compare?

Rank among 1991 cars28th of 179(top 16%)

Rank among BENTLEY models92th of 117(top 79%)

vs national average+9%(82% avg)

vs 1991 cars average+13%(78% avg)

vs BENTLEY average-3%(94% avg)

Mileage Analysis

65,593

Average miles

259,000

Expected for age

The average 1991 BENTLEY EIGHT has 65,593 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 1992 model with a 100% MOT pass rate, while the 1990 model has the lowest at 66%. The 1991 sits between the two at 91%.

BENTLEY EIGHT by Year

Year	Pass Rate	Tests	Avg Mileage
1992	100%	68	54,272 mi
1991	91%	54	65,593 mi
1990	66%	98	84,204 mi

Similar Cars to Consider

ROLLS ROYCE SILVER SPIRIT

1990 · 6750cc Petrol

£2,247/year

87%

-4%

BENTLEY TURBO

1990 · 6750cc Petrol

£2,097/year

93%

+2%

BENTLEY MULSANNE

1990 · 6750cc Petrol

£2,247/year

88%

-3%

BENTLEY BROOKLANDS

1993 · 6750cc Petrol

£2,097/year

95%

+4%

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About the 1991 BENTLEY EIGHT

The 1991 BENTLEY EIGHT is a luxury with a 6750cc petrol engine. 54 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 16% of all 1991 cars for reliability.

With an average of 65,593 miles at 35 years old, BENTLEY EIGHT 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 BENTLEY EIGHT Fuel Costs

The 6750cc 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 BENTLEY EIGHT?

Total estimated annual running cost is £2,607 (£217/month), broken down as £1592 fuel, £760 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 91% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

BENTLEY EIGHT Reliability Trend

Newer BENTLEY EIGHTs show better MOT pass rates than older ones, with an average improvement of 30 percentage points.

Buying a Used 1991 BENTLEY EIGHT

At 35 years old, the BENTLEY EIGHT 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 1992 model has the highest pass rate at 100%. Note: with only 54 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

Based on the 1991 BENTLEY EIGHT'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.

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 BENTLEY EIGHT stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
BENTLEY EIGHT(1991)	91%	£1592	£760	Grp 35-50	£2607
ROLLS ROYCE SILVER SPIRIT(1990)	87%	£1592	£250	Grp 35-50	£2247-£360
BENTLEY TURBO(1990)	93%	£1592	£250	Grp 35-50	£2097-£510
BENTLEY MULSANNE(1990)	88%	£1592	£250	Grp 35-50	£2247-£360
BENTLEY BROOKLANDS(1993)	95%	£1592	£250	Grp 35-50	£2097-£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.