MERCEDES C 300 AMG LINE ED PREM + DE A (2020)
Running costs, reliability data, and common problems from 54 real MOT tests.
Annual Cost
£1,927
£161/month
MOT Pass Rate
87%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1950cc Petrol
Solid Option
87% pass rate, £1927/year to run. 5 points above average.
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Annual Running Costs
~36 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 close to the national average of 82%.
At 6 years old, 87% of MERCEDES C 300 AMG LINE ED PREM + DE As from 2020 passed their MOT first time in 2026. That's based on 54 tests across the UK. The average mileage at this age is 48,220 miles.
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How Does It Compare?
Mileage Analysis
48,220
Average miles
44,400
Expected for age
The average 2020 MERCEDES C 300 AMG LINE ED PREM + DE A has 48,220 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
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MERCEDES C 300 AMG LINE ED PREM + DE A by Year
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About the 2020 MERCEDES C 300 AMG LINE ED PREM + DE A
The 2020 MERCEDES C 300 AMG LINE ED PREM + DE A is a family car with a 1950cc petrol engine. 54 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 88% of 2020 cars for MOT pass rates.
With an average of 48,220 miles at 6 years old, MERCEDES C 300 AMG LINE ED PREM + DE A owners drive about as much as the UK average.
2020 MERCEDES C 300 AMG LINE ED PREM + DE A Fuel Costs
The 1950cc 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 MERCEDES C 300 AMG LINE ED PREM + DE A?
Total estimated annual running cost is £1,927 (£161/month), broken down as £1327 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 87% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2020 MERCEDES C 300 AMG LINE ED PREM + DE A
At 6 years old, the MERCEDES C 300 AMG LINE ED PREM + DE A 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 54 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2020 MERCEDES C 300 AMG LINE ED PREM + DE A's fuel type, age, and engine size, these are the most likely problem areas to check.
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 2020 MERCEDES C 300 AMG LINE ED PREM + DE A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES C 300 AMG LINE ED PREM + DE A(2020) | 87% | £1327 | £195 | Grp 18-32 | £1927 |
| LAND ROVER DISCOVERY SPORT R-DYN SE D A(2020) | 90% | £1327 | £190 | Grp 18-32 | £1772-£155 |
| BMW 520D M SPORT MHEV AUTO(2021) | 89% | £1327 | £190 | Grp 18-32 | £1922-£5 |
| BMW 320D M SPORT MHEV AUTO(2021) | 91% | £1327 | £190 | Grp 18-32 | £1772-£155 |
| VOLVO XC90 R-DESIGN B5 MHEV AWD AUTO(2021) | 90% | £1327 | £190 | Grp 18-32 | £1772-£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.
Related Mercedes Models
Explore other Mercedes cars or similar models in the same category.
MERCEDES A
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MERCEDES A-CLASS
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LAND ROVER DISCOVERY SPORT R-DYN SE D A
2020 · 1999cc Petrol
BMW 520D M SPORT MHEV AUTO
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BMW 320D M SPORT MHEV AUTO
2021 · 1995cc Petrol
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