BENTLEY UNCLASSIFIED (1990)
Running costs, reliability data, and common problems from 35 real MOT tests.
Annual Cost
£2,907
£242/month
MOT Pass Rate
74%
Average
Road Tax
£760
Based on CC/year
Insurance
Grp 35-50
6750cc Petrol
Check Carefully
74% pass rate, £2907/year to run. 8 points below average.
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Annual Running Costs
~30 mpg
Based on 6750cc
Higher estimate due to low pass rate
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
Average reliability. Expect some repairs as it ages. That's 8 points below the national average of 82%. It falls below the BENTLEY brand average of 94%.
At 36 years old, 74% of BENTLEY UNCLASSIFIEDs from 1990 passed their MOT first time in 2026. That's based on 35 tests across the UK. The average mileage at this age is 62,638 miles.
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How Does It Compare?
Mileage Analysis
62,638
Average miles
266,400
Expected for age
The average 1990 BENTLEY UNCLASSIFIED has 62,638 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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About the 1990 BENTLEY UNCLASSIFIED
The 1990 BENTLEY UNCLASSIFIED is a luxury with a 6750cc petrol engine. 35 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 78% of 1990 cars for MOT pass rates.
With an average of 62,638 miles at 36 years old, BENTLEY UNCLASSIFIED 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 BENTLEY UNCLASSIFIED 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 1990 BENTLEY UNCLASSIFIED?
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 74% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 1990 BENTLEY UNCLASSIFIED
At 36 years old, the BENTLEY UNCLASSIFIED 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. Note: with only 35 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 1990 BENTLEY UNCLASSIFIED's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 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 riskLarger 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 outAt 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 outRubber 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 riskAlways 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 BENTLEY UNCLASSIFIED stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BENTLEY UNCLASSIFIED(1990) | 74% | £1592 | £760 | Grp 35-50 | £2907 |
| ROLLS ROYCE SILVER SPIRIT(1990) | 87% | £1592 | £250 | Grp 35-50 | £2247-£660 |
| BENTLEY TURBO(1990) | 93% | £1592 | £250 | Grp 35-50 | £2097-£810 |
| BENTLEY MULSANNE(1990) | 88% | £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.
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