Is the 2021 MERCEDES CL reliable?

Excellent reliability. Very few MOT failures. 100% of MERCEDES CLs from 2021 passed their MOT first time in 2026, based on 38 tests. That's 18 points above the national average of 82%.

How much does a 2021 MERCEDES CL cost to run?

Estimated annual running cost is £1,587 (£132/month), including £1137 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2021 MERCEDES CL?

The 2021 MERCEDES CL has a 100% MOT pass rate based on 38 tests in 2026. This ranks 68 out of 3373 cars from 2021.

Which year MERCEDES CL is most reliable?

The 2012 MERCEDES CL has the highest MOT pass rate at 94%. The least reliable year is 2000 at 76%.

MERCEDES CL (2021)

Q: What is the average mileage for a 2021 MERCEDES CL?

The average mileage for a 2021 MERCEDES CL is 14,783 miles, which is significantly below the expected 37,000 miles for a 5-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.

Running costs, reliability data, and common problems from 38 real MOT tests.

Annual Cost

£1,587

£132/month

MOT Pass Rate

100%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 8-20

1400cc Petrol

Great Choice

100% pass rate, £1587/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

£1,137

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,587

Per month£132/mo

Per week£31/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

100% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 18 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.

At 5 years old, 100% of MERCEDES CLs from 2021 passed their MOT first time in 2026. That's based on 38 tests across the UK. The average mileage at this age is 14,783 miles.

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How Does It Compare?

Rank among 2021 cars68th of 3,373(top 2%)

Rank among MERCEDES models33th of 1,408(top 2%)

vs national average+18%(82% avg)

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

vs MERCEDES average+13%(87% avg)

Mileage Analysis

14,783

Average miles

37,000

Expected for age

The average 2021 MERCEDES CL has 14,783 miles on the clock, which is significantly below the expected 37,000 miles for a 5-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.

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Best Year to Buy?

The most reliable year is the 2012 model with a 94% MOT pass rate, while the 2000 model has the lowest at 76%. The 2021 sits between the two at 100%.

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

£1,400/year

91%

-9%

VOLKSWAGEN GOLF

2019 · 1498cc Petrol

£1,582/year

92%

-8%

VAUXHALL CORSA

2019 · 1398cc Petrol

£1,732/year

88%

-12%

NISSAN QASHQAI

2020 · 1598cc Petrol

£1,582/year

93%

-7%

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About the 2021 MERCEDES CL

The 2021 MERCEDES CL is a small family car with a 1400cc petrol engine. 38 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 2% of all 2021 cars for reliability.

With an average of 14,783 miles at 5 years old, MERCEDES CL owners tend to use this car less than the typical driver. Very low mileage could mean the car has been garaged or used only for short trips, which can cause its own issues like battery drain and moisture buildup.

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 £1,137 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).

What does it cost to own a 2021 MERCEDES CL?

Total estimated annual running cost is £1,587 (£132/month), broken down as £1137 fuel, £195 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

Newer MERCEDES CLs show better MOT pass rates than older ones, with an average improvement of 4 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

Based on the 2021 MERCEDES CL's fuel type, age, and engine size, these are the most likely problem areas to check.

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 annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES CL(2021)	100%	£1137	£195	Grp 8-20	£1587
FORD FIESTA(2019)	91%	£955	£190	Grp 1-8	£1400-£187
VOLKSWAGEN GOLF(2019)	92%	£1137	£190	Grp 12-25	£1582-£5
VAUXHALL CORSA(2019)	88%	£1137	£190	Grp 8-20	£1732+£145
NISSAN QASHQAI(2020)	93%	£1137	£190	Grp 12-25	£1582-£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.