Mercedes C (2020)

Estimated running costs and MOT pass rates from 16,225 MOT tests in 2024.

Annual Cost

£2,413

£201/month

MOT Pass Rate

92%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 35-50

3982cc Petrol

Great Choice

92% pass rate, £2,413/year to run. 10 points above average.

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Petrol3982cc6 years old16,225 tests34k miles avg

Annual Running Costs

Fuel (Petrol, 3982cc)

~30 mpg

£1,958

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,413

Per month£201/mo

Per week£46/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

92% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 10 points above the average of 82% across all models in our data. It also outperforms the Mercedes brand average of 87%.

92% of MOT tests on Mercedes Cs from 2020 ended in a pass in 2024, when they were about 4 years old. That's based on 16,225 tests across the UK, retests included. The average mileage recorded at those tests was 33,734 miles.

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How Does It Compare?

Rank among 2020 models1194th of 2,554(top half)

Rank among Mercedes models445th of 1,376(top half)

vs average of all models+10%(82% avg)

vs 2020 models average+0%(92% avg)

vs Mercedes average+5%(87% avg)

Mileage Analysis

33,734

Average miles

29,600

Expected for age

The average 2020 Mercedes C had 33,734 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 C by Year

Year	Pass Rate	Tests	Avg Mileage
2021	92%	3,772	27,184 mi
2020	92%	16,225	33,734 mi
2019	91%	52,838	40,700 mi
2018	90%	62,138	51,166 mi
2017	89%	87,612	60,957 mi
2016	88%	80,181	73,695 mi
2015	86%	71,635	85,216 mi
2014	85%	54,729	90,129 mi
2013	81%	51,703	97,102 mi
2012	79%	59,235	102,461 mi
2011	79%	42,676	109,800 mi
2010	78%	28,538	111,322 mi
2009	77%	28,440	118,861 mi
2008	77%	30,369	121,672 mi
2007	76%	25,544	119,028 mi
2006	74%	20,205	118,301 mi
2005	73%	17,978	121,824 mi
2004	72%	13,493	116,683 mi
2003	73%	9,158	112,103 mi
2002	75%	4,985	103,944 mi
2001	75%	2,463	101,994 mi
2000	77%	1,103	104,741 mi
1999	82%	2,683	110,180 mi
1998	79%	2,916	112,877 mi
1997	81%	2,336	121,767 mi
1996	82%	1,296	107,809 mi
1995	83%	1,017	101,913 mi
1994	84%	735	103,968 mi
1993	82%	71	105,975 mi
1992	87%	30	131,044 mi
1991	79%	47	112,139 mi
1990	66%	41	103,332 mi

Similar Cars to Consider

Porsche Cayenne

2019 · 3996cc Petrol

£2,413/year

95%

+3%

Porsche 911

2018 · 3996cc Petrol

£2,413/year

96%

+4%

Audi A6

2020 · 3996cc Petrol

£2,413/year

94%

+2%

Bentley Continental GT

2019 · 3996cc Petrol

£2,413/year

97%

+5%

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About the 2020 Mercedes C

The 2020 Mercedes C is a premium performance car. Our records list a 3982cc petrol engine, though engines vary between versions. 16,225 MOT tests were recorded on this model in 2024, making it one of the most commonly tested models on UK roads. Among all models from 2020, the average MOT pass rate is 92%, and this model matches that benchmark.

With an average of 33,734 miles recorded at its 2024 MOT tests, Mercedes C owners drive about as much as the UK average.

2020 Mercedes C Fuel Costs

The 3982cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,958 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 C?

Total estimated annual running cost is £2,413 (£201/month), broken down as £1,958 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

Mercedes C Reliability Trend

Newer Mercedes Cs pass their MOT more often than older ones, by 7 percentage points on average, which is mostly down to age and wear.

Buying a Used 2020 Mercedes C

At 6 years old, the Mercedes C offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. With 16,225 MOT tests in our data, there's strong statistical confidence in these figures.

What the 2020 Mercedes C Fails Its MOT On

Share of the 1,007 MOT tests on the 2020 Mercedes C that failed at the first attempt in 2025, next to all cars and vans of the same age.

Tyres60%
Same age: 35% (fails on this more often)
Suspension13%
Same age: 11%
Brakes10%
Same age: 18% (fails on this less often)
Windscreen, wipers and mirrors10%
Same age: 21% (fails on this less often)

DVSA anonymised MOT data for 2025; a test that failed on two areas counts in both. How we count it · Mercedes C reliability, common problems and years to avoid

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.

Oil Consumption

Low risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

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 C 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 C(2020)	92%	£1,958	£200	Grp 35-50	£2,413
Porsche Cayenne(2019)	95%	£1,958	£200	Grp 35-50	£2,413same
Porsche 911(2018)	96%	£1,958	£200	Grp 35-50	£2,413same
Audi A6(2020)	94%	£1,958	£200	Grp 35-50	£2,413same
Bentley Continental GT(2019)	97%	£1,958	£200	Grp 35-50	£2,413same

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 C

Is the 2020 Mercedes C reliable?

Excellent reliability. Very few MOT failures. 92% of MOT tests on 2020 Mercedes Cs ended in a pass, from 16,225 tests (DVSA MOT data for tests in 2024, retests included). That's 10 points above the average of 82% across all models in the same data.

How much does a 2020 Mercedes C cost to run?

Our estimate is £2,413 a year (£201 a month): £1,958 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 C?

92% of 16,225 MOT tests on the 2020 Mercedes C ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 1194th of 2,554 models first registered in 2020 (top half).

Which year Mercedes C has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 Mercedes C has the highest MOT pass rate at 92% and the 2004 the lowest at 72%. 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 C?

The average mileage recorded at MOT tests on the 2020 Mercedes C is 33,734 miles, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.