BMW 420I M SPORT AUTO (2020)
Running costs, common problems, and reliability data based on 612 real MOT tests in 2024.
MOT Pass Rate
95%
Total Tests (2024)
612
Avg Mileage
28,653 mi
Est. Annual Cost
£1,772
Is the 2020 BMW 420I M SPORT AUTO reliable?
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 4 years old, 95% of BMW 420I M SPORT AUTOs from 2020 passed their MOT first time in 2024. That's based on 612 tests across the UK. The average mileage at this age is 28,653 miles.
How does the 2020 BMW 420I M SPORT AUTO compare?
Mileage Analysis
The average 2020 BMW 420I M SPORT AUTO has 28,653 miles on the clock, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.
Best year to buy a BMW 420I M SPORT AUTO?
The most reliable year is the 2022 model with a 96% MOT pass rate, while the 2021 model has the lowest at 93%. The 2020 sits between the two at 95%.
How much does a 2020 BMW 420I M SPORT AUTO 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 420I M SPORT AUTO by Year
Checking a specific BMW 420I M SPORT AUTO?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2020 BMW 420I M SPORT AUTO
The 2020 BMW 420I M SPORT AUTO is a premium with a 1998cc petrol engine. 612 of these vehicles were MOT tested in 2024, making it a less common model in the UK market. It ranks in the top 19% of all 2020 cars for reliability.
With an average of 28,653 miles at 4 years old, BMW 420I M SPORT AUTO owners drive about as much as the UK average.
2020 BMW 420I M SPORT AUTO Fuel Costs
The 1998cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,327 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 420I M SPORT AUTO?
Total estimated annual running cost is £1,772 (£148/month), broken down as £1327 fuel, £190 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 420I M SPORT AUTO Reliability Trend
The BMW 420I M SPORT AUTO has maintained consistent MOT pass rates across model years, varying by only 1 percentage points.
Buying a Used 2020 BMW 420I M SPORT AUTO
At 4 years old, the BMW 420I 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. If you're flexible on year, the 2022 model has the highest pass rate at 96%.
Alternatives to the 2020 BMW 420I M SPORT AUTO
The BMW 420I M SPORT AUTO is actually the most reliable option among similar petrol premiums from this era. Here are comparable petrol cars with similar engines:
- VOLKSWAGEN GOLF (2019) 92% pass rate (-3%) from 89,653 tests
- FORD KUGA (2018) 90% pass rate (-5%) from 67,605 tests
- MINI COOPER (2018) 92% pass rate (-3%) from 55,706 tests
- NISSAN QASHQAI (2020) 93% pass rate (-2%) from 52,321 tests