Mercedes GLC 300 AMG Line Premium 4M A (2020)

Estimated running costs and MOT pass rates from 432 MOT tests in 2024.

Annual Cost

£2,086

£174/month

MOT Pass Rate

94%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 18-32

1991cc Petrol

Great Choice

94% pass rate, £2,086/year to run. 12 points above average.

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Petrol1991cc6 years old432 tests29k miles avg

Annual Running Costs

Fuel (Petrol, 1991cc)

~36 mpg

£1,631

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,086

Per month£174/mo

Per week£40/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).

Reliability Verdict

94% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 12 points above the average of 82% across all models in our data. It also outperforms the Mercedes brand average of 87%.

94% of MOT tests on Mercedes GLC 300 AMG Line Premium 4M As from 2020 ended in a pass in 2024, when they were about 4 years old. That's based on 432 tests across the UK, retests included. The average mileage recorded at those tests was 28,545 miles.

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How Does It Compare?

Rank among 2020 models755th of 2,554(top half)

Rank among Mercedes models314th of 1,376(top 23%)

vs average of all models+12%(82% avg)

vs 2020 models average+2%(92% avg)

vs Mercedes average+7%(87% avg)

Mileage Analysis

28,545

Average miles

29,600

Expected for age

The average 2020 Mercedes GLC 300 AMG Line Premium 4M A had 28,545 miles on the clock at its 2024 MOT, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.

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Mercedes GLC 300 AMG Line Premium 4M A by Year

Year	Pass Rate	Tests	Avg Mileage
2022	98%	42	18,139 mi
2021	93%	334	27,121 mi
2020	94%	432	28,545 mi
2019	85%	182	35,527 mi

Similar Cars to Consider

Volkswagen Golf

2019 · 1498cc Petrol

£1,853/year

92%

-2%

Ford Kuga

2018 · 1499cc Petrol

£1,853/year

90%

-4%

MINI Cooper

2018 · 1499cc Petrol

£1,853/year

92%

-2%

Nissan Qashqai

2020 · 1598cc Petrol

£1,853/year

93%

-1%

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About the 2020 Mercedes GLC 300 AMG Line Premium 4M A

The 2020 Mercedes GLC 300 AMG Line Premium 4M A is a premium car. Our records list a 1991cc petrol engine, though engines vary between versions. 432 MOT tests were recorded on this model in 2024, making it a less common model in the UK market. Among all models from 2020, the average MOT pass rate is 92%, and this model beats that benchmark.

With an average of 28,545 miles recorded at its 2024 MOT tests, Mercedes GLC 300 AMG Line Premium 4M A owners drive about as much as the UK average.

2020 Mercedes GLC 300 AMG Line Premium 4M A Fuel Costs

The 1991cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,631 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 2020 Mercedes GLC 300 AMG Line Premium 4M A?

Total estimated annual running cost is £2,086 (£174/month), broken down as £1,631 fuel, £200 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 Premium 4M A Reliability Trend

Newer Mercedes GLC 300 AMG Line Premium 4M As pass their MOT more often than older ones, by 9 percentage points on average, which is mostly down to age and wear.

Buying a Used 2020 Mercedes GLC 300 AMG Line Premium 4M A

At 6 years old, the Mercedes GLC 300 AMG Line Premium 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

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

Timing Chain / Belt

Watch out

At 6 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.

Service History

Low risk

Always 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 Premium 4M A stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Mercedes GLC 300 AMG Line Premium 4M A(2020)	94%	£1,631	£200	Grp 18-32	£2,086
Volkswagen Golf(2019)	92%	£1,398	£200	Grp 12-25	£1,853-£233
Ford Kuga(2018)	90%	£1,398	£200	Grp 12-25	£1,853-£233
MINI Cooper(2018)	92%	£1,398	£200	Grp 12-25	£1,853-£233
Nissan Qashqai(2020)	93%	£1,398	£200	Grp 12-25	£1,853-£233

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2020 Mercedes GLC 300 AMG Line Premium 4M A

Is the 2020 Mercedes GLC 300 AMG Line Premium 4M A reliable?

Excellent reliability. Very few MOT failures. 94% of MOT tests on 2020 Mercedes GLC 300 AMG Line Premium 4M As ended in a pass, from 432 tests (DVSA MOT data for tests in 2024, retests included). That's 12 points above the average of 82% across all models in the same data.

How much does a 2020 Mercedes GLC 300 AMG Line Premium 4M A cost to run?

Our estimate is £2,086 a year (£174 a month): £1,631 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2020 Mercedes GLC 300 AMG Line Premium 4M A?

94% of 432 MOT tests on the 2020 Mercedes GLC 300 AMG Line Premium 4M A ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 755th of 2,554 models first registered in 2020 (top half).

Which year Mercedes GLC 300 AMG Line Premium 4M A has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 Mercedes GLC 300 AMG Line Premium 4M A has the highest MOT pass rate at 94% and the 2019 the lowest at 85%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2020 Mercedes GLC 300 AMG Line Premium 4M A?

The average mileage recorded at MOT tests on the 2020 Mercedes GLC 300 AMG Line Premium 4M A is 28,545 miles, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.