MERCEDES GLC 300 AMG LINE ULTIMATE 4M A (2020)
Running costs, reliability data, and common problems from 62 real MOT tests.
Annual Cost
£1,777
£148/month
MOT Pass Rate
100%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1991cc Hybrid
Great Choice
100% pass rate, £1777/year to run. 18 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 18 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 6 years old, 100% of MERCEDES GLC 300 AMG LINE ULTIMATE 4M As from 2020 passed their MOT first time in 2026. That's based on 62 tests across the UK. The average mileage at this age is 24,212 miles.
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How Does It Compare?
Mileage Analysis
24,212
Average miles
44,400
Expected for age
The average 2020 MERCEDES GLC 300 AMG LINE ULTIMATE 4M A has 24,212 miles on the clock, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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About the 2020 MERCEDES GLC 300 AMG LINE ULTIMATE 4M A
The 2020 MERCEDES GLC 300 AMG LINE ULTIMATE 4M A is a family car with a 1991cc hybrid engine. 62 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 1% of all 2020 cars for reliability.
With an average of 24,212 miles at 6 years old, MERCEDES GLC 300 AMG LINE ULTIMATE 4M A owners tend to use this car less than the typical driver.
2020 MERCEDES GLC 300 AMG LINE ULTIMATE 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 2020 MERCEDES GLC 300 AMG LINE ULTIMATE 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 100% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2020 MERCEDES GLC 300 AMG LINE ULTIMATE 4M A
At 6 years old, the MERCEDES GLC 300 AMG LINE ULTIMATE 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. Note: with only 62 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2020 MERCEDES GLC 300 AMG LINE ULTIMATE 4M A's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Medium riskAfter 6 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Low riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Medium riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
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 ULTIMATE 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 ULTIMATE 4M A(2020) | 100% | £1327 | £195 | Grp 18-32 | £1777 |
| MERCEDES C(2018) | 90% | £1327 | £190 | Grp 18-32 | £1772-£5 |
| TOYOTA YARIS(2019) | 93% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| MINI COOPER S(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| LAND ROVER RANGE ROVER SPORT(2019) | 94% | £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
Explore other Mercedes cars or similar models in the same category.
MERCEDES A
2019 · 1461cc Diesel
MERCEDES C
2017 · 1991cc Hybrid
MERCEDES A-CLASS
2017 · 1461cc Diesel
MERCEDES C
2018 · 1991cc Hybrid
TOYOTA YARIS
2019 · 1497cc Hybrid
MINI COOPER S
2019 · 1499cc Hybrid
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