MERCEDES SLC (2021)
Running costs, reliability data, and common problems from 87 real MOT tests.
Annual Cost
£1,777
£148/month
MOT Pass Rate
98%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1991cc Petrol
Great Choice
98% pass rate, £1777/year to run. 16 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 16 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 5 years old, 98% of MERCEDES SLCs from 2021 passed their MOT first time in 2026. That's based on 87 tests across the UK. The average mileage at this age is 13,659 miles.
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Mileage Analysis
13,659
Average miles
37,000
Expected for age
The average 2021 MERCEDES SLC has 13,659 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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MERCEDES SLC by Year
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About the 2021 MERCEDES SLC
The 2021 MERCEDES SLC is a family car with a 1991cc petrol engine. 87 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 7% of all 2021 cars for reliability.
With an average of 13,659 miles at 5 years old, MERCEDES SLC 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 SLC Fuel Costs
The 1991cc 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 SLC?
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 98% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES SLC Reliability Trend
Newer MERCEDES SLCs show better MOT pass rates than older ones, with an average improvement of 5 percentage points.
Buying a Used 2021 MERCEDES SLC
At 5 years old, the MERCEDES SLC 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 87 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 MERCEDES SLC'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 SLC stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES SLC(2021) | 98% | £1327 | £195 | Grp 18-32 | £1777 |
| VOLKSWAGEN GOLF(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| NISSAN QASHQAI(2020) | 93% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| MINI COOPER(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| HYUNDAI TUCSON(2019) | 90% | £1137 | £190 | Grp 12-25 | £1582-£195 |
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
Explore other Mercedes cars or similar models in the same category.
MERCEDES A
2019 · 1461cc Diesel
MERCEDES C
2017 · 1991cc Hybrid
MERCEDES A-CLASS
2017 · 1461cc Diesel
VOLKSWAGEN GOLF
2019 · 1498cc Petrol
NISSAN QASHQAI
2020 · 1598cc Petrol
MINI COOPER
2019 · 1499cc Petrol
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