Bentley Mulsanne (1991)

Estimated running costs and MOT pass rates from 66 MOT tests in 2024.

Annual Cost

£2,738

£228/month

MOT Pass Rate

86%

Good

Road Tax

£375

Estimated/year

Est. Insurance

Grp 35-50

6750cc Petrol

Solid Option

86% pass rate, £2,738/year to run. Close to the average across all models.

Buying this car? Check for finance, write-offs & theft

£4.99

Check a specific Bentley Mulsanne

Enter a reg plate for full MOT history, mileage check, health score, running costs, and reliability data. Free, instant, no signup.

Petrol6750cc35 years old66 tests83k miles avg

Annual Running Costs

Fuel (Petrol, 6750cc)

~30 mpg

£1,958

Road Tax

Pre-2001 engine size rate

£375

MOT Test

£55

Predicted Repairs

£350

Total per year£2,738

Per month£228/mo

Per week£53/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included.

Reliability Verdict

86% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data. It falls below the Bentley brand average of 94%.

86% of MOT tests on Bentley Mulsannes from 1991 ended in a pass in 2024, when they were about 33 years old. That's based on 66 tests across the UK, retests included. The average mileage recorded at those tests was 83,012 miles.

Got a Bentley Mulsanne you're looking at?

Enter the reg plate to check its specific MOT history, mileage, and health score.

How Does It Compare?

Rank among 1991 models53rd of 172(top half)

Rank among Bentley models105th of 115(bottom 10%)

vs average of all models+4%(82% avg)

vs 1991 models average+7%(79% avg)

vs Bentley average-8%(94% avg)

Mileage Analysis

83,012

Average miles

244,200

Expected for age

The average 1991 Bentley Mulsanne had 83,012 miles on the clock at its 2024 MOT, 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.

Looking at a specific Bentley Mulsanne?

Enter its reg plate for a free check with full MOT history, mileage verification, and predicted costs.

Best Year to Buy?

Of the years with at least 100 tests, the 2017 model has the highest MOT pass rate at 99%, while the 1990 model has the lowest at 88%. The 1991 scores 86%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Bentley Mulsanne by Year

Year	Pass Rate	Tests	Avg Mileage
2021	96%	54	9,124 mi
2020	99%	76	12,990 mi
2019	98%	197	21,125 mi
2018	100%	95	27,069 mi
2017	99%	297	22,331 mi
2016	98%	335	27,325 mi
2015	95%	249	28,860 mi
2014	99%	237	41,306 mi
2013	98%	175	35,886 mi
2012	96%	203	43,144 mi
2011	93%	283	47,470 mi
2010	100%	86	60,646 mi
1991	86%	66	83,012 mi
1990	88%	138	78,194 mi

Similar Cars to Consider

Rolls-Royce Silver Spirit

1990 · 6750cc Petrol

£2,738/year

87%

+1%

Bentley Turbo

1990 · 6750cc Petrol

£2,588/year

93%

+7%

Bentley Brooklands

1993 · 6750cc Petrol

£2,588/year

95%

+9%

Bentley Continental

1993 · 6750cc Petrol

£2,588/year

93%

+7%

Check a Specific Bentley Mulsanne

Enter a reg plate to get the full MOT history, health score, and mileage verification.

Upgrade to Premium (£4.99) for stolen, finance, and write-off checks.

About the 1991 Bentley Mulsanne

The 1991 Bentley Mulsanne is a luxury car. Our records list a 6750cc petrol engine, though engines vary between versions. 66 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. Among all models from 1991, the average MOT pass rate is 79%, and this model beats that benchmark.

With an average of 83,012 miles recorded at its 2024 MOT tests, Bentley Mulsanne 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 Mulsanne 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 £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 1991 Bentley Mulsanne?

Total estimated annual running cost is £2,738 (£228/month), broken down as £1,958 fuel, £375 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 86% pass rate. Keeping on top of servicing will help avoid surprises.

Bentley Mulsanne Reliability Trend

Newer Bentley Mulsannes pass their MOT more often than older ones, by 4 percentage points on average, which is mostly down to age and wear.

Buying a Used 1991 Bentley Mulsanne

At 35 years old, the Bentley Mulsanne 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 2017 model has the highest pass rate at 99%. Note: with only 66 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

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

Medium risk

With an average of 83k 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.

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 Mulsanne stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Bentley Mulsanne(1991)	86%	£1,958	£375	Grp 35-50	£2,738
Rolls-Royce Silver Spirit(1990)	87%	£1,958	£375	Grp 35-50	£2,738same
Bentley Turbo(1990)	93%	£1,958	£375	Grp 35-50	£2,588-£150
Bentley Brooklands(1993)	95%	£1,958	£375	Grp 35-50	£2,588-£150
Bentley Continental(1993)	93%	£1,958	£375	Grp 35-50	£2,588-£150

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 1991 Bentley Mulsanne

Is the 1991 Bentley Mulsanne reliable?

Good reliability. Occasional issues but generally solid. 86% of MOT tests on 1991 Bentley Mulsannes ended in a pass, from 66 tests (DVSA MOT data for tests in 2024, retests included). That's 4 points above the average of 82% across all models in the same data.

How much does a 1991 Bentley Mulsanne cost to run?

Our estimate is £2,738 a year (£228 a month): £1,958 fuel, £375 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 1991 Bentley Mulsanne?

86% of 66 MOT tests on the 1991 Bentley Mulsanne ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 53rd of 172 models first registered in 1991 (top half).

Which year Bentley Mulsanne has the best MOT pass rate?

Of the years with at least 100 tests, the 2017 Bentley Mulsanne has the highest MOT pass rate at 99% and the 1990 the lowest at 88%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 1991 Bentley Mulsanne?

The average mileage recorded at MOT tests on the 1991 Bentley Mulsanne is 83,012 miles, 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.