MERCEDES C 300 AMG LINE ED PREM D A (2020)
Running costs, reliability data, and common problems from 1,262 real MOT tests.
Annual Cost
£1,487
£124/month
MOT Pass Rate
92%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1950cc Diesel
Great Choice
92% pass rate, £1487/year to run. 10 points above average.
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Annual Running Costs
~48 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
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
Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 6 years old, 92% of MERCEDES C 300 AMG LINE ED PREM D As from 2020 passed their MOT first time in 2026. That's based on 1,262 tests across the UK. The average mileage at this age is 39,962 miles.
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How Does It Compare?
Mileage Analysis
39,962
Average miles
44,400
Expected for age
The average 2020 MERCEDES C 300 AMG LINE ED PREM D A has 39,962 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 D A by Year
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About the 2020 MERCEDES C 300 AMG LINE ED PREM D A
The 2020 MERCEDES C 300 AMG LINE ED PREM D A is a family car with a 1950cc diesel engine. 1,262 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. Among all cars from 2020, the average MOT pass rate is 92%, and this model falls short of that benchmark.
With an average of 39,962 miles at 6 years old, MERCEDES C 300 AMG LINE ED PREM D A owners drive about as much as the UK average.
2020 MERCEDES C 300 AMG LINE ED PREM D A Fuel Costs
The 1950cc diesel engine offers a reasonable balance between performance and economy. Expect around 48 mpg in mixed driving, which works out to roughly £1,037 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.
What does it cost to own a 2020 MERCEDES C 300 AMG LINE ED PREM D A?
Total estimated annual running cost is £1,487 (£124/month), broken down as £1037 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES C 300 AMG LINE ED PREM D A Reliability Trend
The MERCEDES C 300 AMG LINE ED PREM D A has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
Buying a Used 2020 MERCEDES C 300 AMG LINE ED PREM D A
At 6 years old, the MERCEDES C 300 AMG LINE ED PREM D 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 D A's fuel type, age, and engine size, these are the most likely problem areas to check.
DPF (Diesel Particulate Filter)
Watch outShort journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.
Turbo Wear
Medium riskDiesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.
AdBlue System
Medium riskPost-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.
EGR Valve
Watch outExhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.
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 D 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 D A(2020) | 92% | £1037 | £195 | Grp 18-32 | £1487 |
| VOLKSWAGEN GOLF(2018) | 92% | £1037 | £190 | Grp 18-32 | £1482-£5 |
| FORD FOCUS(2019) | 89% | £905 | £190 | Grp 12-25 | £1500+£13 |
| MERCEDES A(2019) | 91% | £905 | £190 | Grp 12-25 | £1350-£137 |
| MERCEDES A-CLASS(2018) | 89% | £905 | £190 | Grp 12-25 | £1500+£13 |
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
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MERCEDES A-CLASS
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VOLKSWAGEN GOLF
2018 · 1968cc Diesel
FORD FOCUS
2019 · 1499cc Diesel
MERCEDES A
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