MERCEDES CLS (2018)
Running costs, common problems, and reliability data based on 2,552 real MOT tests in 2024.
MOT Pass Rate
89%
Total Tests (2024)
2,552
Avg Mileage
49,336 mi
Est. Annual Cost
£1,840
Is the 2018 MERCEDES CLS reliable?
Good reliability. Occasional issues but generally solid. That's 7 points above the national average of 82%.
At 6 years old, 89% of MERCEDES CLSs from 2018 passed their MOT first time in 2024. That's based on 2,552 tests across the UK. The average mileage at this age is 49,336 miles.
How does the 2018 MERCEDES CLS compare?
Mileage Analysis
The average 2018 MERCEDES CLS has 49,336 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
Best year to buy a MERCEDES CLS?
The most reliable year is the 2019 model with a 90% MOT pass rate, while the 2009 model has the lowest at 78%. The 2018 sits between the two at 89%.
How much does a 2018 MERCEDES CLS cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES CLS by Year
| Year | Pass Rate | Tests | Avg Mileage |
|---|---|---|---|
| 2021 | 90% | 149 | 25,838 mi |
| 2020 | 85% | 708 | 33,613 mi |
| 2019 | 90% | 2,938 | 42,687 mi |
| 2018 | 89% | 2,552 | 49,336 mi |
| 2017 | 87% | 3,475 | 61,581 mi |
| 2016 | 87% | 4,786 | 69,870 mi |
| 2015 | 87% | 6,871 | 81,130 mi |
| 2014 | 85% | 4,192 | 86,883 mi |
| 2013 | 83% | 7,096 | 95,825 mi |
| 2012 | 83% | 2,664 | 97,844 mi |
| 2011 | 82% | 2,675 | 100,976 mi |
| 2010 | 79% | 2,428 | 110,846 mi |
| 2009 | 78% | 2,541 | 114,393 mi |
| 2008 | 78% | 2,982 | 122,863 mi |
| 2007 | 78% | 3,915 | 122,774 mi |
| 2006 | 79% | 3,184 | 117,836 mi |
| 2005 | 81% | 1,944 | 108,622 mi |
Checking a specific MERCEDES CLS?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 MERCEDES CLS
The 2018 MERCEDES CLS is a large car with a 2925cc diesel engine. 2,552 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. Among all cars from 2018, the average MOT pass rate is 89%, and this model falls short of that benchmark.
With an average of 49,336 miles at 6 years old, MERCEDES CLS owners drive about as much as the UK average.
2018 MERCEDES CLS Fuel Costs
The 2925cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.
What does it cost to own a 2018 MERCEDES CLS?
Total estimated annual running cost is £1,840 (£153/month), broken down as £1245 fuel, £190 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 89% pass rate. Keeping on top of servicing will help avoid surprises.
MERCEDES CLS Reliability Trend
Newer MERCEDES CLSs show better MOT pass rates than older ones, with an average improvement of 7 percentage points.
Buying a Used 2018 MERCEDES CLS
At 6 years old, the MERCEDES CLS 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 2019 model has the highest pass rate at 90%.
Alternatives to the 2018 MERCEDES CLS
If reliability is your priority, there are 2 similar cars with a higher MOT pass rate. Here are comparable diesel cars with similar engines:
- MERCEDES E (2019) 90% pass rate (+1%) from 41,000 tests
- MERCEDES GLC (2018) 91% pass rate (+2%) from 40,494 tests
- AUDI A5 (2017) 89% pass rate (same) from 33,531 tests
- FORD RANGER (2019) 87% pass rate (-2%) from 32,194 tests