BMW 340I (2018)
Running costs, common problems, and reliability data based on 459 real MOT tests in 2024.
MOT Pass Rate
94%
Total Tests (2024)
459
Avg Mileage
41,504 mi
Est. Annual Cost
£2,037
Is the 2018 BMW 340I reliable?
Excellent reliability. Very few MOT failures. That's 12 points above the national average of 82%. It also outperforms the BMW brand average of 88%.
At 6 years old, 94% of BMW 340Is from 2018 passed their MOT first time in 2024. That's based on 459 tests across the UK. The average mileage at this age is 41,504 miles.
How does the 2018 BMW 340I compare?
Mileage Analysis
The average 2018 BMW 340I has 41,504 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
Best year to buy a BMW 340I?
The most reliable year is the 2016 model with a 95% MOT pass rate, while the 2019 model has the lowest at 90%. The 2018 sits between the two at 94%.
How much does a 2018 BMW 340I cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
BMW 340I by Year
Checking a specific BMW 340I?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 BMW 340I
The 2018 BMW 340I is a premium performance with a 2998cc petrol engine. 459 of these vehicles were MOT tested in 2024, making it a less common model in the UK market. It ranks in the top 21% of all 2018 cars for reliability.
With an average of 41,504 miles at 6 years old, BMW 340I owners drive about as much as the UK average.
2018 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 2018 BMW 340I?
Total estimated annual running cost is £2,037 (£170/month), broken down as £1592 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 94% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
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 2018 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%.
Alternatives to the 2018 BMW 340I
The BMW 340I is actually the most reliable option among similar petrol premium performances from this era. Here are comparable petrol cars with similar engines:
- BMW 5 SERIES (2018) 91% pass rate (-3%) from 40,272 tests
- LAND ROVER RANGE ROVER SPORT (2018) 93% pass rate (-1%) from 34,257 tests
- BMW X3 (2019) 92% pass rate (-2%) from 32,937 tests
- MERCEDES GLC (2019) 93% pass rate (-1%) from 30,341 tests