BMW X6 M50I Auto (2021)
Estimated running costs and MOT pass rates from 177 MOT tests in 2024.
Annual Cost
£2,563
£214/month
MOT Pass Rate
86%
Good
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 35-50
4395cc Petrol
Solid Option
86% pass rate, £2,563/year to run. Close to the average across all models.
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Annual Running Costs
~30 mpg
Standard rate (from April 2017)
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
Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data.
86% of MOT tests on BMW X6 M50I Autos from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 177 tests across the UK, retests included. The average mileage recorded at those tests was 26,234 miles.
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How Does It Compare?
Mileage Analysis
26,234
Average miles
22,200
Expected for age
The average 2021 BMW X6 M50I Auto had 26,234 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 89%, while the 2021 model has the lowest at 86%. 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.
Similar Cars to Consider
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About the 2021 BMW X6 M50I Auto
The 2021 BMW X6 M50I Auto is a premium performance car. Our records list a 4395cc petrol engine, though engines vary between versions. 177 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It sits in the bottom 10% of 2021 models for MOT pass rate.
With an average of 26,234 miles recorded at its 2024 MOT tests, BMW X6 M50I Auto owners drive about as much as the UK average.
2021 BMW X6 M50I Auto Fuel Costs
The 4395cc 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 X6 M50I 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 86% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 BMW X6 M50I Auto
At 5 years old, the BMW X6 M50I 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 riskLarger 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 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 2021 BMW X6 M50I 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 X6 M50I Auto(2021) | 86% | £1,958 | £200 | Grp 35-50 | £2,563 |
| Mercedes C(2019) | 91% | £1,958 | £200 | Grp 35-50 | £2,413-£150 |
| Porsche Cayenne(2019) | 95% | £1,958 | £200 | Grp 35-50 | £2,413-£150 |
| Porsche 911(2019) | 97% | £1,958 | £200 | Grp 35-50 | £2,413-£150 |
| Audi A6(2020) | 94% | £1,958 | £200 | Grp 35-50 | £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 X6 M50I Auto
Is the 2021 BMW X6 M50I Auto reliable?
Good reliability. Occasional issues but generally solid. 86% of MOT tests on 2021 BMW X6 M50I Autos ended in a pass, from 177 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 2021 BMW X6 M50I 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 X6 M50I Auto?
86% of 177 MOT tests on the 2021 BMW X6 M50I Auto ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 3022nd of 3,336 models first registered in 2021 (bottom 10%).
Which year BMW X6 M50I Auto has the best MOT pass rate?
Of the years with at least 100 tests, the 2020 BMW X6 M50I Auto has the highest MOT pass rate at 89% and the 2021 the lowest at 86%. 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 X6 M50I Auto?
The average mileage recorded at MOT tests on the 2021 BMW X6 M50I Auto is 26,234 miles, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.
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