MERCEDES GLC 300 AMG LINE 4MATIC AUTO (2021)
Running costs, common problems, and reliability data based on 746 real MOT tests in 2024.
MOT Pass Rate
94%
Total Tests (2024)
746
Avg Mileage
26,183 mi
Est. Annual Cost
£1,772
Is the 2021 MERCEDES GLC 300 AMG LINE 4MATIC AUTO 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 4MATIC AUTOs from 2021 passed their MOT first time in 2024. That's based on 746 tests across the UK. The average mileage at this age is 26,183 miles.
How does the 2021 MERCEDES GLC 300 AMG LINE 4MATIC AUTO compare?
Mileage Analysis
The average 2021 MERCEDES GLC 300 AMG LINE 4MATIC AUTO has 26,183 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 4MATIC AUTO?
The most reliable year is the 2020 model with a 94% MOT pass rate, while the 2019 model has the lowest at 93%. The 2021 sits between the two at 94%.
How much does a 2021 MERCEDES GLC 300 AMG LINE 4MATIC 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 GLC 300 AMG LINE 4MATIC AUTO by Year
Checking a specific MERCEDES GLC 300 AMG LINE 4MATIC AUTO?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 MERCEDES GLC 300 AMG LINE 4MATIC AUTO
The 2021 MERCEDES GLC 300 AMG LINE 4MATIC AUTO is a family car with a 1991cc hybrid engine. 746 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 26,183 miles at 3 years old, MERCEDES GLC 300 AMG LINE 4MATIC AUTO owners drive about as much as the UK average.
2021 MERCEDES GLC 300 AMG LINE 4MATIC AUTO 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 4MATIC AUTO?
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 4MATIC AUTO Reliability Trend
The MERCEDES GLC 300 AMG LINE 4MATIC AUTO has maintained consistent MOT pass rates across model years, varying by only 1 percentage points.
Buying a Used 2021 MERCEDES GLC 300 AMG LINE 4MATIC 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. If you're flexible on year, the 2020 model has the highest pass rate at 94%.
Alternatives to the 2021 MERCEDES GLC 300 AMG LINE 4MATIC AUTO
The MERCEDES GLC 300 AMG LINE 4MATIC AUTO 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