How much does a 1991 BENTLEY MULSANNE cost to run?

Estimated annual running cost is £2,757 (£230/month), including £1592 fuel, £760 road tax, £55 MOT, and £350 predicted repairs.

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

The 1991 BENTLEY MULSANNE has a 86% MOT pass rate based on 66 tests in 2026. This ranks 53 out of 179 cars from 1991.

Which year BENTLEY MULSANNE is most reliable?

The 2018 BENTLEY MULSANNE has the highest MOT pass rate at 100%. The least reliable year is 1991 at 86%.

BENTLEY MULSANNE (1991)

Q: Is the 1991 BENTLEY MULSANNE reliable?

Good reliability. Occasional issues but generally solid. 86% of BENTLEY MULSANNEs from 1991 passed their MOT first time in 2026, based on 66 tests. That's 4 points above the national average of 82%.

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

The average mileage for a 1991 BENTLEY MULSANNE is 83,012 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 66 real MOT tests.

Annual Cost

£2,757

£230/month

MOT Pass Rate

86%

Good

Road Tax

£760

Based on CC/year

Insurance

Grp 35-50

6750cc Petrol

Solid Option

86% pass rate, £2757/year to run. Close to the national average.

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Petrol6750cc35 years old66 tests83k miles avg

Annual Running Costs

Fuel (Petrol, 6750cc)

~30 mpg

£1,592

Road Tax

Based on 6750cc

£760

MOT Test

£55

Predicted Repairs

£350

Total per year£2,757

Per month£230/mo

Per week£53/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

86% MOT pass rate(Good)

0%National avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It falls below the BENTLEY brand average of 94%.

At 35 years old, 86% of BENTLEY MULSANNEs from 1991 passed their MOT first time in 2026. That's based on 66 tests across the UK. The average mileage at this age is 83,012 miles.

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How Does It Compare?

Rank among 1991 cars53th of 179(top 30%)

Rank among BENTLEY models106th of 117(top 91%)

vs national average+4%(82% avg)

vs 1991 cars average+8%(78% avg)

vs BENTLEY average-8%(94% avg)

Mileage Analysis

83,012

Average miles

259,000

Expected for age

The average 1991 BENTLEY MULSANNE has 83,012 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 2018 model with a 100% MOT pass rate, while the 1991 model has the lowest at 86%. Consider a different year if reliability is a priority.

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

£2,247/year

87%

+1%

BENTLEY TURBO

1990 · 6750cc Petrol

£2,097/year

93%

+7%

BENTLEY BROOKLANDS

1993 · 6750cc Petrol

£2,097/year

95%

+9%

BENTLEY CONTINENTAL

1993 · 6750cc Petrol

£2,097/year

93%

+7%

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About the 1991 BENTLEY MULSANNE

The 1991 BENTLEY MULSANNE is a luxury with a 6750cc petrol engine. 66 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 1991, the average MOT pass rate is 78%, and this model beats that benchmark.

With an average of 83,012 miles at 35 years old, 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 £1,592 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 MULSANNE?

Total estimated annual running cost is £2,757 (£230/month), broken down as £1592 fuel, £760 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 show better MOT pass rates than older ones, with an average improvement of 4 percentage points.

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. Note: with only 66 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

Based on the 1991 BENTLEY MULSANNE'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.

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 annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
BENTLEY MULSANNE(1991)	86%	£1592	£760	Grp 35-50	£2757
ROLLS ROYCE SILVER SPIRIT(1990)	87%	£1592	£250	Grp 35-50	£2247-£510
BENTLEY TURBO(1990)	93%	£1592	£250	Grp 35-50	£2097-£660
BENTLEY BROOKLANDS(1993)	95%	£1592	£250	Grp 35-50	£2097-£660
BENTLEY CONTINENTAL(1993)	93%	£1592	£250	Grp 35-50	£2097-£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.