BMW 340I (2020)
Running costs, reliability data, and common problems from 30 real MOT tests.
Annual Cost
£2,192
£183/month
MOT Pass Rate
80%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2998cc Petrol
Solid Option
80% pass rate, £2192/year to run. Close to the national average.
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Annual Running Costs
~30 mpg
Flat rate (post-2017)
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
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It falls below the BMW brand average of 88%.
At 6 years old, 80% of BMW 340Is from 2020 passed their MOT first time in 2026. That's based on 30 tests across the UK. The average mileage at this age is 36,809 miles.
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How Does It Compare?
Mileage Analysis
36,809
Average miles
44,400
Expected for age
The average 2020 BMW 340I has 36,809 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
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Best Year to Buy?
The most reliable year is the 2016 model with a 95% MOT pass rate, while the 2019 model has the lowest at 90%. The 2020 sits between the two at 80%.
BMW 340I by Year
Similar Cars to Consider
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About the 2020 BMW 340I
The 2020 BMW 340I is a premium performance with a 2998cc petrol engine. 30 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 98% of 2020 cars for MOT pass rates.
With an average of 36,809 miles at 6 years old, BMW 340I owners drive about as much as the UK average.
2020 BMW 340I 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 340I?
Total estimated annual running cost is £2,192 (£183/month), broken down as £1592 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 80% pass rate. Keeping on top of servicing will help avoid surprises.
BMW 340I Reliability Trend
The BMW 340I has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
Buying a Used 2020 BMW 340I
At 6 years old, the BMW 340I offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2016 model has the highest pass rate at 95%. Note: with only 30 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2020 BMW 340I'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 340I stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BMW 340I(2020) | 80% | £1592 | £195 | Grp 30-42 | £2192 |
| BMW 5 SERIES(2018) | 91% | £1592 | £190 | Grp 30-42 | £2037-£155 |
| LAND ROVER RANGE ROVER SPORT(2018) | 93% | £1592 | £190 | Grp 30-42 | £2037-£155 |
| BMW X3(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£155 |
| MERCEDES GLC(2019) | 93% | £1592 | £190 | Grp 30-42 | £2037-£155 |
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.
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BMW 5 SERIES
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BMW 5 SERIES
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LAND ROVER RANGE ROVER SPORT
2018 · 2995cc Petrol
BMW X3
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