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MERCEDES C (2020)

Running costs, common problems, and reliability data based on 16,225 real MOT tests in 2024.

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MOT Pass Rate

92%

Total Tests (2024)

16,225

Avg Mileage

33,734 mi

Est. Annual Cost

£2,037

Is the 2020 MERCEDES C reliable?

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 4 years old, 92% of MERCEDES Cs from 2020 passed their MOT first time in 2024. That's based on 16,225 tests across the UK. The average mileage at this age is 33,734 miles.

How does the 2020 MERCEDES C compare?

Rank among all 2020 cars1221th out of 2,596(top 47%)
Rank among all MERCEDES models448th out 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

The average 2020 MERCEDES C has 33,734 miles on the clock, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.

How much does a 2020 MERCEDES C cost to run?

⛽Fuel (Petrol, 3982cc)
£1,592
🏛️Road Tax
£190
🔧MOT Test
£55
🛠️Predicted Repairs
£200
Total per year£2,037
Per month£170/mo

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.

MERCEDES C by Year

YearPass RateTestsAvg Mileage
202192%3,77227,184 mi
202092%16,22533,734 mi
201991%52,83840,700 mi
201890%62,13851,166 mi
201789%87,61260,957 mi
201688%80,18173,695 mi
201586%71,63585,216 mi
201485%54,72990,129 mi
201381%51,70397,102 mi
201279%59,235102,461 mi
201179%42,676109,800 mi
201078%28,538111,322 mi
200977%28,440118,861 mi
200877%30,369121,672 mi
200776%25,544119,028 mi
200674%20,205118,301 mi
200573%17,978121,824 mi
200472%13,493116,683 mi
200373%9,158112,103 mi
200275%4,985103,944 mi
200175%2,463101,994 mi
200077%1,103104,741 mi
199982%2,683110,180 mi
199879%2,916112,877 mi
199781%2,336121,767 mi
199682%1,296107,809 mi
199583%1,017101,913 mi
199484%735103,968 mi
199382%71105,975 mi
199287%30131,044 mi
199179%47112,139 mi
199066%41103,332 mi

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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 2024, 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 4 years old, 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 £1,592 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 £2,037 (£170/month), broken down as £1592 fuel, £190 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 4 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.

Alternatives to the 2020 MERCEDES C

If reliability is your priority, there are 4 similar cars with a higher MOT pass rate. Here are comparable petrol cars with similar engines: