MERCEDES C 300 SPORT EDITION DE AUTO (2021)
Running costs, common problems, and reliability data based on 189 real MOT tests in 2024.
MOT Pass Rate
87%
Total Tests (2024)
189
Avg Mileage
51,193 mi
Est. Annual Cost
£1,922
Is the 2021 MERCEDES C 300 SPORT EDITION DE AUTO reliable?
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%.
At 3 years old, 87% of MERCEDES C 300 SPORT EDITION DE AUTOs from 2021 passed their MOT first time in 2024. That's based on 189 tests across the UK. The average mileage at this age is 51,193 miles.
How does the 2021 MERCEDES C 300 SPORT EDITION DE AUTO compare?
Mileage Analysis
The average 2021 MERCEDES C 300 SPORT EDITION DE AUTO has 51,193 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 SPORT EDITION DE AUTO?
The most reliable year is the 2020 model with a 93% MOT pass rate, while the 2021 model has the lowest at 87%. Consider a different year if reliability is a priority.
How much does a 2021 MERCEDES C 300 SPORT EDITION DE AUTO 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 SPORT EDITION DE AUTO by Year
Checking a specific MERCEDES C 300 SPORT EDITION DE AUTO?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 MERCEDES C 300 SPORT EDITION DE AUTO
The 2021 MERCEDES C 300 SPORT EDITION DE AUTO is a family car with a 1950cc petrol engine. 189 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It sits in the bottom 88% of 2021 cars for MOT pass rates.
With an average of 51,193 miles at 3 years old, MERCEDES C 300 SPORT EDITION DE AUTO 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 SPORT EDITION DE AUTO 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 SPORT EDITION DE AUTO?
Total estimated annual running cost is £1,922 (£160/month), broken down as £1327 fuel, £190 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 2021 MERCEDES C 300 SPORT EDITION DE AUTO
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.
Alternatives to the 2021 MERCEDES C 300 SPORT EDITION DE AUTO
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 (+3%) from 5,505 tests
- BMW 520D M SPORT MHEV AUTO (2021) 89% pass rate (+2%) from 3,423 tests
- BMW 320D M SPORT MHEV AUTO (2021) 91% pass rate (+4%) from 3,336 tests
- VOLVO XC90 R-DESIGN B5 MHEV AWD AUTO (2021) 90% pass rate (+3%) from 2,911 tests