BMW 340I (2020)

Estimated running costs and MOT pass rates from 30 MOT tests in 2024.

Annual Cost

£2,563

£214/month

MOT Pass Rate

80%

Good

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 30-42

2998cc Petrol

Solid Option

80% pass rate, £2,563/year to run. Close to the average across all models.

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Petrol2998cc6 years old30 tests37k 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

80% 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. It falls below the BMW brand average of 88%.

80% of MOT tests on BMW 340Is from 2020 ended in a pass in 2024, when they were about 4 years old. That's based on 30 tests across the UK, retests included. The average mileage recorded at those tests was 36,809 miles.

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How Does It Compare?

Rank among 2020 models2507th of 2,554(bottom 2%)

Rank among BMW models1356th of 1,548(bottom 13%)

vs average of all models-2%(82% avg)

vs 2020 models average-12%(92% avg)

vs BMW average-8%(88% avg)

Mileage Analysis

36,809

Average miles

29,600

Expected for age

The average 2020 BMW 340I had 36,809 miles on the clock at its 2024 MOT, which is above the expected 29,600 miles for a 4-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.

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Best Year to Buy?

Of the years with at least 100 tests, the 2016 model has the highest MOT pass rate at 95%, while the 2019 model has the lowest at 90%. The 2020 scores 80%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

BMW 340I by Year

Year	Pass Rate	Tests	Avg Mileage
2021	96%	49	21,253 mi
2020	80%	30	36,809 mi
2019	90%	158	33,798 mi
2018	94%	459	41,504 mi
2017	92%	963	52,872 mi
2016	95%	229	59,892 mi

Similar Cars to Consider

BMW 5 Series

2018 · 2998cc Petrol

£2,413/year

91%

+11%

Land Rover Range Rover Sport

2018 · 2995cc Petrol

£2,413/year

93%

+13%

BMW X3

2019 · 2998cc Petrol

£2,413/year

92%

+12%

Mercedes GLC

2019 · 2996cc Petrol

£2,413/year

93%

+13%

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About the 2020 BMW 340I

The 2020 BMW 340I is a premium performance car. Our records list a 2998cc petrol engine, though engines vary between versions. 30 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It sits in the bottom 2% of 2020 models for MOT pass rate.

With an average of 36,809 miles recorded at its 2024 MOT tests, BMW 340I owners cover more miles than the average driver.

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 £1,958 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 2020 BMW 340I?

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 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

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.

Timing Chain / Belt

Watch out

At 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 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 2020 BMW 340I 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 340I(2020)	80%	£1,958	£200	Grp 30-42	£2,563
BMW 5 Series(2018)	91%	£1,958	£200	Grp 30-42	£2,413-£150
Land Rover Range Rover Sport(2018)	93%	£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

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 2020 BMW 340I

Is the 2020 BMW 340I reliable?

Good reliability. Occasional issues but generally solid. 80% of MOT tests on 2020 BMW 340Is ended in a pass, from 30 tests (DVSA MOT data for tests in 2024, retests included). That's 2 points below the average of 82% across all models in the same data.

How much does a 2020 BMW 340I 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 2020 BMW 340I?

80% of 30 MOT tests on the 2020 BMW 340I ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 2507th of 2,554 models first registered in 2020 (bottom 2%).

Which year BMW 340I has the best MOT pass rate?

Of the years with at least 100 tests, the 2016 BMW 340I has the highest MOT pass rate at 95% and the 2019 the lowest at 90%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2020 BMW 340I?

The average mileage recorded at MOT tests on the 2020 BMW 340I is 36,809 miles, which is above the expected 29,600 miles for a 4-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.