BENTLEY EIGHT (1991)
Running costs, common problems, and reliability data based on 54 real MOT tests in 2024.
MOT Pass Rate
91%
Total Tests (2024)
54
Avg Mileage
65,593 mi
Est. Annual Cost
£2,097
Is the 1991 BENTLEY EIGHT reliable?
Excellent reliability. Very few MOT failures. That's 9 points above the national average of 82%.
At 33 years old, 91% of BENTLEY EIGHTs from 1991 passed their MOT first time in 2024. That's based on 54 tests across the UK. The average mileage at this age is 65,593 miles.
How does the 1991 BENTLEY EIGHT compare?
Mileage Analysis
The average 1991 BENTLEY EIGHT has 65,593 miles on the clock, which is significantly below the expected 244,200 miles for a 33-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 BENTLEY EIGHT?
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%.
How much does a 1991 BENTLEY EIGHT 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.
BENTLEY EIGHT by Year
Checking a specific BENTLEY EIGHT?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
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 2024, 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 33 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 £2,097 (£175/month), broken down as £1592 fuel, £250 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 33 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.
Alternatives to the 1991 BENTLEY EIGHT
If reliability is your priority, there are 2 similar cars with a higher MOT pass rate. Here are comparable petrol cars with similar engines:
- ROLLS ROYCE SILVER SPIRIT (1990) 87% pass rate (-4%) from 314 tests
- BENTLEY TURBO (1990) 93% pass rate (+2%) from 243 tests
- BENTLEY MULSANNE (1990) 88% pass rate (-3%) from 138 tests
- BENTLEY BROOKLANDS (1993) 95% pass rate (+4%) from 126 tests