MERCEDES C 300 AMG LINE ED PREM D A (2021)
Running costs, common problems, and reliability data based on 246 real MOT tests in 2024.
MOT Pass Rate
92%
Total Tests (2024)
246
Avg Mileage
29,758 mi
Est. Annual Cost
£1,482
Is the 2021 MERCEDES C 300 AMG LINE ED PREM D A reliable?
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 3 years old, 92% of MERCEDES C 300 AMG LINE ED PREM D As from 2021 passed their MOT first time in 2024. That's based on 246 tests across the UK. The average mileage at this age is 29,758 miles.
How does the 2021 MERCEDES C 300 AMG LINE ED PREM D A compare?
Mileage Analysis
The average 2021 MERCEDES C 300 AMG LINE ED PREM D A has 29,758 miles on the clock, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
Best year to buy a MERCEDES C 300 AMG LINE ED PREM D A?
The most reliable year is the 2020 model with a 92% MOT pass rate, while the 2019 model has the lowest at 90%. The 2021 sits between the two at 92%.
How much does a 2021 MERCEDES C 300 AMG LINE ED PREM D A cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES C 300 AMG LINE ED PREM D A by Year
Checking a specific MERCEDES C 300 AMG LINE ED PREM D A?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 MERCEDES C 300 AMG LINE ED PREM D A
The 2021 MERCEDES C 300 AMG LINE ED PREM D A is a family car with a 1950cc diesel engine. 246 of these vehicles were MOT tested in 2024, making it a less common model in the UK market. Among all cars from 2021, the average MOT pass rate is 92%, and this model falls short of that benchmark.
With an average of 29,758 miles at 3 years old, MERCEDES C 300 AMG LINE ED PREM D A owners cover more miles than the average driver.
2021 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).
What does it cost to own a 2021 MERCEDES C 300 AMG LINE ED PREM D A?
Total estimated annual running cost is £1,482 (£124/month), broken down as £1037 fuel, £190 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 2021 MERCEDES C 300 AMG LINE ED PREM D A
At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet. If you're flexible on year, the 2020 model has the highest pass rate at 92%.
Alternatives to the 2021 MERCEDES C 300 AMG LINE ED PREM D A
The MERCEDES C 300 AMG LINE ED PREM D A is actually the most reliable option among similar diesel family cars from this era. Here are comparable diesel cars with similar engines:
- FORD FOCUS (2019) 89% pass rate (-3%) from 93,803 tests
- MERCEDES A (2019) 91% pass rate (-1%) from 89,588 tests
- FORD KUGA (2019) 91% pass rate (-1%) from 72,831 tests
- VOLKSWAGEN POLO (2019) 89% pass rate (-3%) from 65,751 tests