Mercedes AMG GT Black Series Auto (2021)
Estimated running costs and MOT pass rates from 30 MOT tests in 2024.
Annual Cost
£2,713
£226/month
MOT Pass Rate
73%
Average
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 35-50
3982cc Petrol
Check Carefully
73% pass rate, £2,713/year to run. 9 points below average.
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Annual Running Costs
~30 mpg
Standard rate (from April 2017)
Higher estimate due to low pass rate
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
Average reliability. Expect some repairs as it ages. That's 9 points below the average of 82% across all models in our data. It falls below the Mercedes brand average of 87%.
73% of MOT tests on Mercedes AMG GT Black Series Autos from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 30 tests across the UK, retests included. The average mileage recorded at those tests was 2,940 miles.
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How Does It Compare?
Mileage Analysis
2,940
Average miles
22,200
Expected for age
The average 2021 Mercedes AMG GT Black Series Auto had 2,940 miles on the clock at its 2024 MOT, which is significantly below the expected 22,200 miles for a 3-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 Mercedes AMG GT Black Series Auto
The 2021 Mercedes AMG GT Black Series Auto is a premium performance car. Our records list a 3982cc 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 1% of 2021 models for MOT pass rate.
With an average of 2,940 miles recorded at its 2024 MOT tests, Mercedes AMG GT Black Series 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 Mercedes AMG GT Black Series Auto Fuel Costs
The 3982cc 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 2021 Mercedes AMG GT Black Series Auto?
Total estimated annual running cost is £2,713 (£226/month), broken down as £1,958 fuel, £200 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 73% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 Mercedes AMG GT Black Series Auto
At 5 years old, the Mercedes AMG GT Black Series 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 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.
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 Mercedes AMG GT Black Series Auto 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 |
|---|---|---|---|---|---|
| Mercedes AMG GT Black Series Auto(2021) | 73% | £1,958 | £200 | Grp 35-50 | £2,713 |
| Mercedes C(2019) | 91% | £1,958 | £200 | Grp 35-50 | £2,413-£300 |
| Porsche Cayenne(2019) | 95% | £1,958 | £200 | Grp 35-50 | £2,413-£300 |
| Porsche 911(2019) | 97% | £1,958 | £200 | Grp 35-50 | £2,413-£300 |
| Audi A6(2020) | 94% | £1,958 | £200 | Grp 35-50 | £2,413-£300 |
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 2021 Mercedes AMG GT Black Series Auto
Is the 2021 Mercedes AMG GT Black Series Auto reliable?
Average reliability. Expect some repairs as it ages. 73% of MOT tests on 2021 Mercedes AMG GT Black Series Autos ended in a pass, from 30 tests (DVSA MOT data for tests in 2024, retests included). That's 9 points below the average of 82% across all models in the same data.
How much does a 2021 Mercedes AMG GT Black Series Auto cost to run?
Our estimate is £2,713 a year (£226 a month): £1,958 fuel, £200 road tax, £55 MOT and £500 predicted repairs, based on 7,400 miles a year. Insurance is not included.
What is the MOT pass rate for a 2021 Mercedes AMG GT Black Series Auto?
73% of 30 MOT tests on the 2021 Mercedes AMG GT Black Series Auto ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 3325th of 3,336 models first registered in 2021 (bottom 1%).
What is the average mileage for a 2021 Mercedes AMG GT Black Series Auto?
The average mileage recorded at MOT tests on the 2021 Mercedes AMG GT Black Series Auto is 2,940 miles, which is significantly below the expected 22,200 miles for a 3-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.
Related Mercedes Models
Explore other Mercedes cars or similar models in the same category.
Mercedes A
2019 · 1461cc Diesel
Mercedes C
2017 · 1991cc Hybrid
Mercedes A-Class
2017 · 1461cc Diesel
Mercedes C
2019 · 3982cc Petrol
Porsche Cayenne
2019 · 3996cc Petrol
Porsche 911
2019 · 3996cc Petrol
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