MERCEDES GLC 300 AMG LINE PREM + 4M A (2021)
Running costs, common problems, and reliability data based on 517 real MOT tests in 2024.
MOT Pass Rate
94%
Total Tests (2024)
517
Avg Mileage
24,423 mi
Est. Annual Cost
£1,772
Is the 2021 MERCEDES GLC 300 AMG LINE PREM + 4M A reliable?
Excellent reliability. Very few MOT failures. That's 12 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 3 years old, 94% of MERCEDES GLC 300 AMG LINE PREM + 4M As from 2021 passed their MOT first time in 2024. That's based on 517 tests across the UK. The average mileage at this age is 24,423 miles.
How does the 2021 MERCEDES GLC 300 AMG LINE PREM + 4M A compare?
Mileage Analysis
The average 2021 MERCEDES GLC 300 AMG LINE PREM + 4M A has 24,423 miles on the clock, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.
Best year to buy a MERCEDES GLC 300 AMG LINE PREM + 4M A?
The most reliable year is the 2020 model with a 95% MOT pass rate, while the 2019 model has the lowest at 94%. The 2021 sits between the two at 94%.
How much does a 2021 MERCEDES GLC 300 AMG LINE PREM + 4M 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 GLC 300 AMG LINE PREM + 4M A by Year
Checking a specific MERCEDES GLC 300 AMG LINE PREM + 4M A?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 MERCEDES GLC 300 AMG LINE PREM + 4M A
The 2021 MERCEDES GLC 300 AMG LINE PREM + 4M A is a family car with a 1991cc hybrid engine. 517 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 beats that benchmark.
With an average of 24,423 miles at 3 years old, MERCEDES GLC 300 AMG LINE PREM + 4M A owners drive about as much as the UK average.
2021 MERCEDES GLC 300 AMG LINE PREM + 4M 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 2021 MERCEDES GLC 300 AMG LINE PREM + 4M A?
Total estimated annual running cost is £1,772 (£148/month), broken down as £1327 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 94% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES GLC 300 AMG LINE PREM + 4M A Reliability Trend
The MERCEDES GLC 300 AMG LINE PREM + 4M A has maintained consistent MOT pass rates across model years, varying by only 1 percentage points.
Buying a Used 2021 MERCEDES GLC 300 AMG LINE PREM + 4M 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 95%.
Alternatives to the 2021 MERCEDES GLC 300 AMG LINE PREM + 4M A
The MERCEDES GLC 300 AMG LINE PREM + 4M A is actually the most reliable option among similar hybrid family cars from this era. Here are comparable hybrid cars with similar engines:
- TOYOTA YARIS (2019) 93% pass rate (-1%) from 41,554 tests
- MINI COOPER S (2019) 92% pass rate (-2%) from 33,682 tests
- LAND ROVER RANGE ROVER SPORT (2019) 94% pass rate (same) from 33,069 tests
- TOYOTA C-HR (2019) 92% pass rate (-2%) from 29,893 tests