MERCEDES CLS300AMG LN NE PRM+D MHEV4M A (2021)
Running costs, reliability data, and common problems from 51 real MOT tests.
Annual Cost
£1,777
£148/month
MOT Pass Rate
92%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1993cc Petrol
Great Choice
92% pass rate, £1777/year to run. 10 points above average.
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Annual Running Costs
~36 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
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
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 5 years old, 92% of MERCEDES CLS300AMG LN NE PRM+D MHEV4M As from 2021 passed their MOT first time in 2026. That's based on 51 tests across the UK. The average mileage at this age is 22,359 miles.
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How Does It Compare?
Mileage Analysis
22,359
Average miles
37,000
Expected for age
The average 2021 MERCEDES CLS300AMG LN NE PRM+D MHEV4M A has 22,359 miles on the clock, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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About the 2021 MERCEDES CLS300AMG LN NE PRM+D MHEV4M A
The 2021 MERCEDES CLS300AMG LN NE PRM+D MHEV4M A is a family car with a 1993cc petrol engine. 51 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 2021, the average MOT pass rate is 92%, and this model falls short of that benchmark.
With an average of 22,359 miles at 5 years old, MERCEDES CLS300AMG LN NE PRM+D MHEV4M A owners tend to use this car less than the typical driver.
2021 MERCEDES CLS300AMG LN NE PRM+D MHEV4M A Fuel Costs
The 1993cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,327 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 CLS300AMG LN NE PRM+D MHEV4M A?
Total estimated annual running cost is £1,777 (£148/month), broken down as £1327 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.
Buying a Used 2021 MERCEDES CLS300AMG LN NE PRM+D MHEV4M A
At 5 years old, the MERCEDES CLS300AMG LN NE PRM+D MHEV4M A offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 51 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 MERCEDES CLS300AMG LN NE PRM+D MHEV4M A's fuel type, age, and engine size, these are the most likely problem areas to check.
Service History
Low riskAlways 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 CLS300AMG LN NE PRM+D MHEV4M A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES CLS300AMG LN NE PRM+D MHEV4M A(2021) | 92% | £1327 | £195 | Grp 18-32 | £1777 |
| LAND ROVER DISCOVERY SPORT R-DYN SE D A(2020) | 90% | £1327 | £190 | Grp 18-32 | £1772-£5 |
| BMW 520D M SPORT MHEV AUTO(2021) | 89% | £1327 | £190 | Grp 18-32 | £1922+£145 |
| BMW 320D M SPORT MHEV AUTO(2021) | 91% | £1327 | £190 | Grp 18-32 | £1772-£5 |
| VOLVO XC90 R-DESIGN B5 MHEV AWD AUTO(2021) | 90% | £1327 | £190 | Grp 18-32 | £1772-£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.
Related Mercedes Models
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MERCEDES A-CLASS
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LAND ROVER DISCOVERY SPORT R-DYN SE D A
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