Is the 2020 MERCEDES C reliable?

Excellent reliability. Very few MOT failures. 92% of MERCEDES Cs from 2020 passed their MOT first time in 2026, based on 16,225 tests. That's 10 points above the national average of 82%.

How much does a 2020 MERCEDES C cost to run?

Estimated annual running cost is £2,042 (£170/month), including £1592 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2020 MERCEDES C?

The 2020 MERCEDES C has a 92% MOT pass rate based on 16,225 tests in 2026. This ranks 1221 out of 2596 cars from 2020.

Which year MERCEDES C is most reliable?

The 2020 MERCEDES C has the highest MOT pass rate at 92%. The least reliable year is 2004 at 72%.

MERCEDES C (2020)

Q: What is the average mileage for a 2020 MERCEDES C?

The average mileage for a 2020 MERCEDES C is 33,734 miles, 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.

Running costs, reliability data, and common problems from 16,225 real MOT tests.

Annual Cost

£2,042

£170/month

MOT Pass Rate

92%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 35-50

3982cc Petrol

Great Choice

92% pass rate, £2042/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

£1,592

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,042

Per month£170/mo

Per week£39/wk

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

92% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.

At 6 years old, 92% of MERCEDES Cs from 2020 passed their MOT first time in 2026. That's based on 16,225 tests across the UK. The average mileage at this age is 33,734 miles.

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How Does It Compare?

Rank among 2020 cars1221th of 2,596(top 47%)

Rank among MERCEDES models448th of 1,408(top 32%)

vs national average+10%(82% avg)

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

vs MERCEDES average+5%(87% avg)

Mileage Analysis

33,734

Average miles

44,400

Expected for age

The average 2020 MERCEDES C has 33,734 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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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

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PORSCHE CAYENNE

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95%

+3%

PORSCHE 911

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AUDI A6

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£2,037/year

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BENTLEY CONTINENTAL GT

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About the 2020 MERCEDES C

The 2020 MERCEDES C is a performance with a 3982cc petrol engine. 16,225 of these vehicles were MOT tested in 2026, making it one of the most commonly tested cars on UK roads. Among all cars from 2020, the average MOT pass rate is 92%, and this model falls short of that benchmark.

With an average of 33,734 miles at 6 years old, MERCEDES C owners tend to use this car less than the typical driver.

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 £1,592 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 C?

Total estimated annual running cost is £2,042 (£170/month), broken down as £1592 fuel, £195 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 show better MOT pass rates than older ones, with an average improvement of 6 percentage points.

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.

Common Issues to Watch For

Based on the 2020 MERCEDES C's fuel type, age, and engine size, these are the most likely problem areas to check.

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 annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES C(2020)	92%	£1592	£195	Grp 35-50	£2042
PORSCHE CAYENNE(2019)	95%	£1592	£190	Grp 35-50	£2037-£5
PORSCHE 911(2018)	96%	£1592	£190	Grp 35-50	£2037-£5
AUDI A6(2020)	94%	£1592	£190	Grp 35-50	£2037-£5
BENTLEY CONTINENTAL GT(2019)	97%	£1592	£190	Grp 35-50	£2037-£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.