BMW 840I Auto (2021)

Estimated running costs and MOT pass rates from 419 MOT tests in 2024.

Annual Cost

£2,563

£214/month

MOT Pass Rate

85%

Good

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 30-42

2998cc Petrol

Solid Option

85% pass rate, £2,563/year to run. Close to the average across all models.

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Petrol2998cc5 years old419 tests26k miles avg

Annual Running Costs

Fuel (Petrol, 2998cc)

~30 mpg

£1,958

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

£350

Total per year£2,563

Per month£214/mo

Per week£49/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. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).

Reliability Verdict

85% 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.

85% of MOT tests on BMW 840I Autos from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 419 tests across the UK, retests included. The average mileage recorded at those tests was 25,806 miles.

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How Does It Compare?

Rank among 2021 models3068th of 3,336(bottom 9%)

Rank among BMW models1126th of 1,548(bottom half)

vs average of all models+3%(82% avg)

vs 2021 models average-7%(92% avg)

vs BMW average-3%(88% avg)

Mileage Analysis

25,806

Average miles

22,200

Expected for age

The average 2021 BMW 840I Auto had 25,806 miles on the clock at its 2024 MOT, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.

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Best Year to Buy?

Of the years with at least 100 tests, the 2020 model has the highest MOT pass rate at 93%, while the 2021 model has the lowest at 85%. Consider a different year if reliability is a priority. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

BMW 840I Auto by Year

Year	Pass Rate	Tests	Avg Mileage
2021	85%	419	25,806 mi
2020	93%	4,056	30,790 mi
2019	90%	801	35,477 mi

Similar Cars to Consider

BMW 5 Series

2019 · 2998cc Petrol

£2,413/year

92%

+7%

BMW X3

2019 · 2998cc Petrol

£2,413/year

92%

+7%

Mercedes GLC

2019 · 2996cc Petrol

£2,413/year

93%

+8%

BMW X5

2019 · 2998cc Petrol

£2,413/year

92%

+7%

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About the 2021 BMW 840I Auto

The 2021 BMW 840I Auto is a premium performance car. Our records list a 2998cc petrol engine, though engines vary between versions. 419 MOT tests were recorded on this model in 2024, making it a less common model in the UK market. It sits in the bottom 9% of 2021 models for MOT pass rate.

With an average of 25,806 miles recorded at its 2024 MOT tests, BMW 840I Auto owners drive about as much as the UK average.

2021 BMW 840I Auto Fuel Costs

The 2998cc 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 2021 BMW 840I Auto?

Total estimated annual running cost is £2,563 (£214/month), broken down as £1,958 fuel, £200 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 85% pass rate. Keeping on top of servicing will help avoid surprises.

BMW 840I Auto Reliability Trend

The BMW 840I Auto has maintained consistent MOT pass rates across model years, varying by only 1 percentage point.

Buying a Used 2021 BMW 840I Auto

At 5 years old, the BMW 840I Auto offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.

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.

Oil Consumption

Low risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

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 2021 BMW 840I Auto 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
BMW 840I Auto(2021)	85%	£1,958	£200	Grp 30-42	£2,563
BMW 5 Series(2019)	92%	£1,958	£200	Grp 30-42	£2,413-£150
BMW X3(2019)	92%	£1,958	£200	Grp 30-42	£2,413-£150
Mercedes GLC(2019)	93%	£1,958	£200	Grp 30-42	£2,413-£150
BMW X5(2019)	92%	£1,958	£200	Grp 30-42	£2,413-£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 2021 BMW 840I Auto

Is the 2021 BMW 840I Auto reliable?

Good reliability. Occasional issues but generally solid. 85% of MOT tests on 2021 BMW 840I Autos ended in a pass, from 419 tests (DVSA MOT data for tests in 2024, retests included). That's 3 points above the average of 82% across all models in the same data.

How much does a 2021 BMW 840I Auto cost to run?

Our estimate is £2,563 a year (£214 a month): £1,958 fuel, £200 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 2021 BMW 840I Auto?

85% of 419 MOT tests on the 2021 BMW 840I Auto ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 3068th of 3,336 models first registered in 2021 (bottom 9%).

Which year BMW 840I Auto has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 BMW 840I Auto has the highest MOT pass rate at 93% and the 2021 the lowest at 85%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2021 BMW 840I Auto?

The average mileage recorded at MOT tests on the 2021 BMW 840I Auto is 25,806 miles, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.