BMW M5 CS AUTO (2021)
Running costs, reliability data, and common problems from 56 real MOT tests.
Annual Cost
£2,192
£183/month
MOT Pass Rate
88%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 35-50
4395cc Petrol
Solid Option
88% pass rate, £2192/year to run. 6 points above 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 6 points above the national average of 82%.
At 5 years old, 88% of BMW M5 CS AUTOs from 2021 passed their MOT first time in 2026. That's based on 56 tests across the UK. The average mileage at this age is 11,098 miles.
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How Does It Compare?
Mileage Analysis
11,098
Average miles
37,000
Expected for age
The average 2021 BMW M5 CS AUTO has 11,098 miles on the clock, which is significantly below the expected 37,000 miles for a 5-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.
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About the 2021 BMW M5 CS AUTO
The 2021 BMW M5 CS AUTO is a premium performance with a 4395cc petrol engine. 56 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 86% of 2021 cars for MOT pass rates.
With an average of 11,098 miles at 5 years old, BMW M5 CS AUTO owners tend to use this car less than the typical driver. Very low mileage could mean the car has been garaged or used only for short trips, which can cause its own issues like battery drain and moisture buildup.
2021 BMW M5 CS AUTO Fuel Costs
The 4395cc 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 2021 BMW M5 CS AUTO?
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 88% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 BMW M5 CS AUTO
At 5 years old, the BMW M5 CS AUTO offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 56 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 BMW M5 CS AUTO's fuel type, age, and engine size, these are the most likely problem areas to check.
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 2021 BMW M5 CS AUTO stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BMW M5 CS AUTO(2021) | 88% | £1592 | £195 | Grp 35-50 | £2192 |
| MERCEDES C(2019) | 91% | £1592 | £190 | Grp 35-50 | £2037-£155 |
| PORSCHE CAYENNE(2019) | 95% | £1592 | £190 | Grp 35-50 | £2037-£155 |
| PORSCHE 911(2019) | 97% | £1592 | £190 | Grp 35-50 | £2037-£155 |
| AUDI A6(2020) | 94% | £1592 | £190 | Grp 35-50 | £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.
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