Mercedes C (2018)

Estimated running costs and MOT pass rates from 62,138 MOT tests in 2024.

Annual Cost

£2,086

£174/month

MOT Pass Rate

90%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 18-32

1991cc Hybrid

Great Choice

90% pass rate, £2,086/year to run. 8 points above average.

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Hybrid1991cc8 years old62,138 tests51k miles avg

Annual Running Costs

Fuel (Hybrid, 1991cc)

~36 mpg (petrol-engine estimate; hybrids usually use less)

£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

90% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 8 points above the average of 82% across all models in our data.

90% of MOT tests on Mercedes Cs from 2018 ended in a pass in 2024, when they were about 6 years old. That's based on 62,138 tests across the UK, retests included. The average mileage recorded at those tests was 51,166 miles.

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How Does It Compare?

Rank among 2018 models288th of 607(top half)

Rank among Mercedes models605th of 1,376(top half)

vs average of all models+8%(82% avg)

vs 2018 models average+1%(89% avg)

vs Mercedes average+3%(87% avg)

Mileage Analysis

51,166

Average miles

44,400

Expected for age

The average 2018 Mercedes C had 51,166 miles on the clock at its 2024 MOT, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.

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Best Year to Buy?

Of the years with at least 100 tests, the 2020 model has the highest MOT pass rate at 92%, while the 2004 model has the lowest at 72%. The 2018 scores 90%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

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

Toyota Yaris

2019 · 1497cc Hybrid

£1,853/year

93%

+3%

MINI Cooper S

2019 · 1499cc Hybrid

£1,853/year

92%

+2%

Land Rover Range Rover Sport

2019 · 1997cc Hybrid

£2,086/year

94%

+4%

Toyota Prius

2019 · 1797cc Hybrid

£2,086/year

94%

+4%

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About the 2018 Mercedes C

The 2018 Mercedes C is a premium car. Our records list a 1991cc hybrid engine, though engines vary between versions. 62,138 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 2018, the average MOT pass rate is 89%, and this model beats that benchmark.

With an average of 51,166 miles recorded at its 2024 MOT tests, Mercedes C owners drive about as much as the UK average.

2018 Mercedes C Fuel Costs

The 1991cc hybrid engine offers a reasonable balance between performance and economy. Our estimate uses around 36 mpg, the figure for a petrol engine of this size, 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). As a hybrid it should use less than that, and real-world fuel costs depend a lot on how much electric-only driving you do.

What does it cost to own a 2018 Mercedes C?

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 90% 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 2018 Mercedes C

At 8 years old, this is a solid used buy if you find one with good service history. Depreciation has levelled off, so you won't lose much more value. Focus on condition over mileage. If you're flexible on year, the 2020 model has the highest pass rate at 92%. With 62,138 MOT tests in our data, there's strong statistical confidence in these figures.

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.

Hybrid Battery Health

Watch out

After 8 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

Medium risk

The 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 risk

Brake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.

Suspension Wear

Medium risk

Shock absorbers, springs, and anti-roll bar links typically need attention around this age. Listen for clunks over bumps and check for uneven tyre wear.

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 2018 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(2018)	90%	£1,631	£200	Grp 18-32	£2,086
Toyota Yaris(2019)	93%	£1,398	£200	Grp 12-25	£1,853-£233
MINI Cooper S(2019)	92%	£1,398	£200	Grp 12-25	£1,853-£233
Land Rover Range Rover Sport(2019)	94%	£1,631	£200	Grp 18-32	£2,086same
Toyota Prius(2019)	94%	£1,631	£200	Grp 18-32	£2,086same

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 2018 Mercedes C

Is the 2018 Mercedes C reliable?

Excellent reliability. Very few MOT failures. 90% of MOT tests on 2018 Mercedes Cs ended in a pass, from 62,138 tests (DVSA MOT data for tests in 2024, retests included). That's 8 points above the average of 82% across all models in the same data.

How much does a 2018 Mercedes C 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 2018 Mercedes C?

90% of 62,138 MOT tests on the 2018 Mercedes C ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 288th of 607 models first registered in 2018 (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 2018 Mercedes C?

The average mileage recorded at MOT tests on the 2018 Mercedes C is 51,166 miles, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.