MERCEDES C 300 AMG LINE ED PREM + E A (2020)
Running costs, reliability data, and common problems from 134 real MOT tests.
Annual Cost
£1,927
£161/month
MOT Pass Rate
82%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1991cc Hybrid
Solid Option
82% pass rate, £1927/year to run. Close to the national 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%. It falls below the MERCEDES brand average of 87%.
At 6 years old, 82% of MERCEDES C 300 AMG LINE ED PREM + E As from 2020 passed their MOT first time in 2026. That's based on 134 tests across the UK. The average mileage at this age is 42,651 miles.
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How Does It Compare?
Mileage Analysis
42,651
Average miles
44,400
Expected for age
The average 2020 MERCEDES C 300 AMG LINE ED PREM + E A has 42,651 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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Best Year to Buy?
The most reliable year is the 2021 model with a 84% MOT pass rate, while the 2020 model has the lowest at 82%. Consider a different year if reliability is a priority.
MERCEDES C 300 AMG LINE ED PREM + E A by Year
Similar Cars to Consider
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About the 2020 MERCEDES C 300 AMG LINE ED PREM + E A
The 2020 MERCEDES C 300 AMG LINE ED PREM + E A is a family car with a 1991cc hybrid engine. 134 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 96% of 2020 cars for MOT pass rates.
With an average of 42,651 miles at 6 years old, MERCEDES C 300 AMG LINE ED PREM + E A owners drive about as much as the UK average.
2020 MERCEDES C 300 AMG LINE ED PREM + E A Fuel Costs
The 1991cc hybrid 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 hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.
What does it cost to own a 2020 MERCEDES C 300 AMG LINE ED PREM + E 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 82% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2020 MERCEDES C 300 AMG LINE ED PREM + E A
At 6 years old, the MERCEDES C 300 AMG LINE ED PREM + E A offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.
Common Issues to Watch For
Based on the 2020 MERCEDES C 300 AMG LINE ED PREM + E A's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Medium riskAfter 6 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Low riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Medium riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
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 + E 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 + E A(2020) | 82% | £1327 | £195 | Grp 18-32 | £1927 |
| MERCEDES C(2018) | 90% | £1327 | £190 | Grp 18-32 | £1772-£155 |
| TOYOTA YARIS(2019) | 93% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| MINI COOPER S(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| LAND ROVER RANGE ROVER SPORT(2019) | 94% | £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
2019 · 1461cc Diesel
MERCEDES C
2017 · 1991cc Hybrid
MERCEDES A-CLASS
2017 · 1461cc Diesel
MERCEDES C
2018 · 1991cc Hybrid
TOYOTA YARIS
2019 · 1497cc Hybrid
MINI COOPER S
2019 · 1499cc Hybrid
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