MERCEDES SLC (2021)
Running costs, common problems, and reliability data based on 87 real MOT tests in 2024.
MOT Pass Rate
98%
Total Tests (2024)
87
Avg Mileage
13,659 mi
Est. Annual Cost
£1,772
Is the 2021 MERCEDES SLC reliable?
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 3 years old, 98% of MERCEDES SLCs from 2021 passed their MOT first time in 2024. That's based on 87 tests across the UK. The average mileage at this age is 13,659 miles.
How does the 2021 MERCEDES SLC compare?
Mileage Analysis
The average 2021 MERCEDES SLC has 13,659 miles on the clock, 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.
How much does a 2021 MERCEDES SLC 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 SLC by Year
Checking a specific MERCEDES SLC?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
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 2024, 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 3 years old, MERCEDES SLC owners tend to use this car less than the typical driver.
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 £1,772 (£148/month), broken down as £1327 fuel, £190 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 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet. Note: with only 87 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 2021 MERCEDES SLC
The MERCEDES SLC is actually the most reliable option among similar petrol family cars from this era. Here are comparable petrol cars with similar engines:
- VOLKSWAGEN GOLF (2019) 92% pass rate (-6%) from 89,653 tests
- NISSAN QASHQAI (2020) 93% pass rate (-5%) from 52,321 tests
- MINI COOPER (2019) 92% pass rate (-6%) from 52,140 tests
- HYUNDAI TUCSON (2019) 90% pass rate (-8%) from 42,920 tests