MERCEDES C 300 AMG LINE ED PREMIUM DE A (2021)
Running costs, common problems, and reliability data based on 56 real MOT tests in 2024.
MOT Pass Rate
77%
Total Tests (2024)
56
Avg Mileage
47,155 mi
Est. Annual Cost
£2,072
Is the 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE A reliable?
Average reliability. Expect some repairs as it ages. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.
At 3 years old, 77% of MERCEDES C 300 AMG LINE ED PREMIUM DE As from 2021 passed their MOT first time in 2024. That's based on 56 tests across the UK. The average mileage at this age is 47,155 miles.
How does the 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE A compare?
Mileage Analysis
The average 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE A has 47,155 miles on the clock, which is well above the expected 22,200 miles for a 3-year-old car. Check service history carefully, as high-mileage cars need consistent maintenance to stay reliable.
Best year to buy a MERCEDES C 300 AMG LINE ED PREMIUM DE A?
The most reliable year is the 2020 model with a 84% MOT pass rate, while the 2021 model has the lowest at 77%. Consider a different year if reliability is a priority.
How much does a 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE 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 PREMIUM DE A by Year
Checking a specific MERCEDES C 300 AMG LINE ED PREMIUM DE 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 PREMIUM DE A
The 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE A is a family car with a 1950cc petrol engine. 56 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It sits in the bottom 99% of 2021 cars for MOT pass rates.
With an average of 47,155 miles at 3 years old, MERCEDES C 300 AMG LINE ED PREMIUM DE A owners cover more miles than the average driver. High-mileage examples should be checked carefully for wear on suspension, brakes, and drivetrain components.
2021 MERCEDES C 300 AMG LINE ED PREMIUM 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 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE A?
Total estimated annual running cost is £2,072 (£173/month), broken down as £1327 fuel, £190 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 77% pass rate. Keeping on top of servicing will help avoid surprises.
MERCEDES C 300 AMG LINE ED PREMIUM DE A Reliability Trend
Older MERCEDES C 300 AMG LINE ED PREMIUM DE As tend to have better MOT pass rates than newer ones, with an average decline of 4 percentage points across model years.
Buying a Used 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE 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. Note: with only 56 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 2021 MERCEDES C 300 AMG LINE ED PREMIUM DE A
If reliability is your priority, there are 4 similar cars with a higher MOT pass rate. Here are comparable petrol cars with similar engines:
- LAND ROVER DISCOVERY SPORT R-DYN SE D A (2020) 90% pass rate (+13%) from 5,505 tests
- BMW 520D M SPORT MHEV AUTO (2021) 89% pass rate (+12%) from 3,423 tests
- BMW 320D M SPORT MHEV AUTO (2021) 91% pass rate (+14%) from 3,336 tests
- VOLVO XC90 R-DESIGN B5 MHEV AWD AUTO (2021) 90% pass rate (+13%) from 2,911 tests