Mercedes CL (2021)

Estimated running costs and MOT pass rates from 38 MOT tests in 2024.

Annual Cost

£1,853

£154/month

MOT Pass Rate

100%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 8-20

1400cc Petrol

Great Choice

100% pass rate, £1,853/year to run. 18 points above average.

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Petrol1400cc5 years old38 tests15k miles avg

Annual Running Costs

Fuel (Petrol, 1400cc)

~42 mpg

£1,398

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,853

Per month£154/mo

Per week£36/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

100% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 18 points above the average of 82% across all models in our data. It also outperforms the Mercedes brand average of 87%.

100% of MOT tests on Mercedes CLs from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 38 tests across the UK, retests included. The average mileage recorded at those tests was 14,783 miles.

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How Does It Compare?

Rank among 2021 models65th of 3,336(top 2%)

Rank among Mercedes models33rd of 1,376(top 3%)

vs average of all models+18%(82% avg)

vs 2021 models average+8%(92% avg)

vs Mercedes average+13%(87% avg)

Mileage Analysis

14,783

Average miles

22,200

Expected for age

The average 2021 Mercedes CL had 14,783 miles on the clock at its 2024 MOT, which is below the expected 22,200 miles for a 3-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Best Year to Buy?

Of the years with at least 100 tests, the 2012 model has the highest MOT pass rate at 94%, while the 2001 model has the lowest at 78%. The 2021 scores 100%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Mercedes CL by Year

Year	Pass Rate	Tests	Avg Mileage
2021	100%	38	14,783 mi
2014	91%	246	61,866 mi
2013	87%	276	61,865 mi
2012	94%	172	66,464 mi
2011	89%	159	73,701 mi
2010	85%	150	77,076 mi
2009	81%	119	86,705 mi
2008	80%	241	78,575 mi
2007	88%	468	104,864 mi
2006	89%	79	94,133 mi
2005	93%	70	94,005 mi
2004	87%	112	79,723 mi
2003	86%	250	105,101 mi
2002	82%	330	94,742 mi
2001	78%	116	116,951 mi
2000	76%	78	91,007 mi
1999	78%	72	16,669 mi
1998	79%	113	101,277 mi
1997	92%	118	104,546 mi

Similar Cars to Consider

Ford Fiesta

2019 · 998cc Petrol

£1,630/year

91%

-9%

Volkswagen Golf

2019 · 1498cc Petrol

£1,853/year

92%

-8%

Vauxhall Corsa

2019 · 1398cc Petrol

£2,003/year

88%

-12%

Nissan Qashqai

2020 · 1598cc Petrol

£1,853/year

93%

-7%

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About the 2021 Mercedes CL

The 2021 Mercedes CL is a premium car. Our records list a 1400cc petrol engine, though engines vary between versions. 38 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 2% of all 2021 models for MOT pass rate.

With an average of 14,783 miles recorded at its 2024 MOT tests, Mercedes CL owners tend to use this car less than the typical driver.

2021 Mercedes CL Fuel Costs

The 1400cc petrol engine offers a reasonable balance between performance and economy. Expect around 42 mpg in mixed driving, which works out to roughly £1,398 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 2021 Mercedes CL?

Total estimated annual running cost is £1,853 (£154/month), broken down as £1,398 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 100% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

Mercedes CL Reliability Trend

The Mercedes CL has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.

Buying a Used 2021 Mercedes CL

At 5 years old, the Mercedes CL offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2012 model has the highest pass rate at 94%. Note: with only 38 tests in our data, these figures should be treated as indicative rather than definitive.

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.

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 2021 Mercedes CL 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 CL(2021)	100%	£1,398	£200	Grp 8-20	£1,853
Ford Fiesta(2019)	91%	£1,175	£200	Grp 1-8	£1,630-£223
Volkswagen Golf(2019)	92%	£1,398	£200	Grp 12-25	£1,853same
Vauxhall Corsa(2019)	88%	£1,398	£200	Grp 8-20	£2,003+£150
Nissan Qashqai(2020)	93%	£1,398	£200	Grp 12-25	£1,853same

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 2021 Mercedes CL

Is the 2021 Mercedes CL reliable?

Excellent reliability. Very few MOT failures. 100% of MOT tests on 2021 Mercedes CLs ended in a pass, from 38 tests (DVSA MOT data for tests in 2024, retests included). That's 18 points above the average of 82% across all models in the same data.

How much does a 2021 Mercedes CL cost to run?

Our estimate is £1,853 a year (£154 a month): £1,398 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 2021 Mercedes CL?

100% of 38 MOT tests on the 2021 Mercedes CL ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 65th of 3,336 models first registered in 2021 (top 2%).

Which year Mercedes CL has the best MOT pass rate?

Of the years with at least 100 tests, the 2012 Mercedes CL has the highest MOT pass rate at 94% and the 2001 the lowest at 78%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2021 Mercedes CL?

The average mileage recorded at MOT tests on the 2021 Mercedes CL is 14,783 miles, which is below the expected 22,200 miles for a 3-year-old car. This suggests lighter use than average, which generally means less wear on major components.