MERCEDES GLC 300 AMG LINE PREM DE 4M A (2020)
Running costs, reliability data, and common problems from 624 real MOT tests.
Annual Cost
£1,777
£148/month
MOT Pass Rate
95%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1950cc Petrol
Great Choice
95% pass rate, £1777/year to run. 13 points above average.
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Annual Running Costs
~36 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
Excellent reliability. Very few MOT failures. That's 13 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 6 years old, 95% of MERCEDES GLC 300 AMG LINE PREM DE 4M As from 2020 passed their MOT first time in 2026. That's based on 624 tests across the UK. The average mileage at this age is 39,366 miles.
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How Does It Compare?
Mileage Analysis
39,366
Average miles
44,400
Expected for age
The average 2020 MERCEDES GLC 300 AMG LINE PREM DE 4M A has 39,366 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
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MERCEDES GLC 300 AMG LINE PREM DE 4M A by Year
Similar Cars to Consider
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About the 2020 MERCEDES GLC 300 AMG LINE PREM DE 4M A
The 2020 MERCEDES GLC 300 AMG LINE PREM DE 4M A is a family car with a 1950cc petrol engine. 624 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It ranks in the top 19% of all 2020 cars for reliability.
With an average of 39,366 miles at 6 years old, MERCEDES GLC 300 AMG LINE PREM DE 4M A owners drive about as much as the UK average.
2020 MERCEDES GLC 300 AMG LINE PREM DE 4M 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 2020 MERCEDES GLC 300 AMG LINE PREM DE 4M A?
Total estimated annual running cost is £1,777 (£148/month), broken down as £1327 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2020 MERCEDES GLC 300 AMG LINE PREM DE 4M A
At 6 years old, the MERCEDES GLC 300 AMG LINE PREM DE 4M A offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.
Common Issues to Watch For
Based on the 2020 MERCEDES GLC 300 AMG LINE PREM DE 4M A's fuel type, age, and engine size, these are the most likely problem areas to check.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2020 MERCEDES GLC 300 AMG LINE PREM DE 4M A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES GLC 300 AMG LINE PREM DE 4M A(2020) | 95% | £1327 | £195 | Grp 18-32 | £1777 |
| LAND ROVER DISCOVERY SPORT R-DYN SE D A(2020) | 90% | £1327 | £190 | Grp 18-32 | £1772-£5 |
| BMW 520D M SPORT MHEV AUTO(2021) | 89% | £1327 | £190 | Grp 18-32 | £1922+£145 |
| BMW 320D M SPORT MHEV AUTO(2021) | 91% | £1327 | £190 | Grp 18-32 | £1772-£5 |
| VOLVO XC90 R-DESIGN B5 MHEV AWD AUTO(2021) | 90% | £1327 | £190 | Grp 18-32 | £1772-£5 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
Related Mercedes Models
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MERCEDES A
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MERCEDES A-CLASS
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LAND ROVER DISCOVERY SPORT R-DYN SE D A
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BMW 520D M SPORT MHEV AUTO
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BMW 320D M SPORT MHEV AUTO
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