BMW 840I M SPORT AUTO (2020)
Running costs, reliability data, and common problems from 292 real MOT tests.
Annual Cost
£2,042
£170/month
MOT Pass Rate
95%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2998cc Petrol
Great Choice
95% pass rate, £2042/year to run. 13 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 13 points above the national average of 82%. It also outperforms the BMW brand average of 88%.
At 6 years old, 95% of BMW 840I M SPORT AUTOs from 2020 passed their MOT first time in 2026. That's based on 292 tests across the UK. The average mileage at this age is 27,477 miles.
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How Does It Compare?
Mileage Analysis
27,477
Average miles
44,400
Expected for age
The average 2020 BMW 840I M SPORT AUTO has 27,477 miles on the clock, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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BMW 840I M SPORT AUTO by Year
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About the 2020 BMW 840I M SPORT AUTO
The 2020 BMW 840I M SPORT AUTO is a premium performance with a 2998cc petrol engine. 292 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It ranks in the top 21% of all 2020 cars for reliability.
With an average of 27,477 miles at 6 years old, BMW 840I M SPORT AUTO owners tend to use this car less than the typical driver.
2020 BMW 840I M SPORT 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 2020 BMW 840I M SPORT 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 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
BMW 840I M SPORT AUTO Reliability Trend
Older BMW 840I M SPORT AUTOs tend to have better MOT pass rates than newer ones, with an average decline of 4 percentage points across model years.
Buying a Used 2020 BMW 840I M SPORT AUTO
At 6 years old, the BMW 840I M SPORT 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
Based on the 2020 BMW 840I M SPORT AUTO's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 6 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
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 2020 BMW 840I M SPORT AUTO stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BMW 840I M SPORT AUTO(2020) | 95% | £1592 | £195 | Grp 30-42 | £2042 |
| BMW 5 SERIES(2018) | 91% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| LAND ROVER RANGE ROVER SPORT(2018) | 93% | £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 |
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
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BMW X3
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