BMW M340I XDRIVE AUTO (2021)
Running costs, reliability data, and common problems from 59 real MOT tests.
Annual Cost
£2,042
£170/month
MOT Pass Rate
100%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2998cc Petrol
Great Choice
100% pass rate, £2042/year to run. 18 points above average.
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Annual Running Costs
~30 mpg
Flat rate (post-2017)
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 18 points above the national average of 82%. It also outperforms the BMW brand average of 88%.
At 5 years old, 100% of BMW M340I XDRIVE AUTOs from 2021 passed their MOT first time in 2026. That's based on 59 tests across the UK. The average mileage at this age is 24,449 miles.
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How Does It Compare?
Mileage Analysis
24,449
Average miles
37,000
Expected for age
The average 2021 BMW M340I XDRIVE AUTO has 24,449 miles on the clock, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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BMW M340I XDRIVE AUTO by Year
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About the 2021 BMW M340I XDRIVE AUTO
The 2021 BMW M340I XDRIVE AUTO is a premium performance with a 2998cc petrol engine. 59 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 1% of all 2021 cars for reliability.
With an average of 24,449 miles at 5 years old, BMW M340I XDRIVE AUTO owners tend to use this car less than the typical driver.
2021 BMW M340I XDRIVE 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 £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 BMW M340I XDRIVE AUTO?
Total estimated annual running cost is £2,042 (£170/month), broken down as £1592 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 100% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
BMW M340I XDRIVE AUTO Reliability Trend
The BMW M340I XDRIVE AUTO has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.
Buying a Used 2021 BMW M340I XDRIVE AUTO
At 5 years old, the BMW M340I XDRIVE AUTO offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 59 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 BMW M340I XDRIVE AUTO's fuel type, age, and engine size, these are the most likely problem areas to check.
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 M340I XDRIVE AUTO stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BMW M340I XDRIVE AUTO(2021) | 100% | £1592 | £195 | Grp 30-42 | £2042 |
| BMW 5 SERIES(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| BMW X3(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| MERCEDES GLC(2019) | 93% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| BMW X5(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£5 |
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.
Related Bmw Models
Explore other Bmw cars or similar models in the same category.
BMW 3 SERIES
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BMW 5 SERIES
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BMW 5 SERIES
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MERCEDES GLC
2019 · 2996cc Petrol
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