BENTLEY ARNAGE (2004)
Running costs, reliability data, and common problems from 334 real MOT tests.
Annual Cost
£2,607
£217/month
MOT Pass Rate
92%
Excellent
Road Tax
£760
Based on CC/year
Insurance
Grp 35-50
6750cc Petrol
Great Choice
92% pass rate, £2607/year to run. 10 points above average.
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Annual Running Costs
~30 mpg
Based on 6750cc
Low estimate due to excellent reliability
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
Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%.
At 22 years old, 92% of BENTLEY ARNAGEs from 2004 passed their MOT first time in 2026. That's based on 334 tests across the UK. The average mileage at this age is 47,432 miles.
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How Does It Compare?
Mileage Analysis
47,432
Average miles
162,800
Expected for age
The average 2004 BENTLEY ARNAGE has 47,432 miles on the clock, which is significantly below the expected 162,800 miles for a 22-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 2007 model with a 96% MOT pass rate, while the 1999 model has the lowest at 88%. The 2004 sits between the two at 92%.
BENTLEY ARNAGE by Year
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About the 2004 BENTLEY ARNAGE
The 2004 BENTLEY ARNAGE is a luxury with a 6750cc petrol engine. 334 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It ranks in the top 6% of all 2004 cars for reliability.
With an average of 47,432 miles at 22 years old, BENTLEY ARNAGE 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.
2004 BENTLEY ARNAGE 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 2004 BENTLEY ARNAGE?
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 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
BENTLEY ARNAGE Reliability Trend
The BENTLEY ARNAGE has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
Buying a Used 2004 BENTLEY ARNAGE
At 22 years old, the BENTLEY ARNAGE 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 2007 model has the highest pass rate at 96%.
Common Issues to Watch For
Based on the 2004 BENTLEY ARNAGE's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 22 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 2004 BENTLEY ARNAGE stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BENTLEY ARNAGE(2004) | 92% | £1592 | £760 | Grp 35-50 | £2607 |
| ROLLS ROYCE PHANTOM(2005) | 97% | £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.
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