Mercedes SL 400 Grand Edition Auto
Reliability, estimated running costs, and MOT data across 2 model years from 147 MOT tests in 2024.
Avg Pass Rate
91%
Total Tests
147
Model Years
2020 to 2021
Years Covered
2
About the Mercedes SL 400 Grand Edition Auto
The Mercedes SL 400 Grand Edition Auto was MOT tested 147 times in 2024 (DVSA data, retests included) across 2 model years (2020 to 2021), with an average pass rate of 91%. That's comfortably above the average of 82% across all models in our data. Our records list petrol versions.
Mileage Across Years
The oldest model in our data (2020) averages 15,215 miles, while the newest (2021) averages 18,981 miles.
Compared to the Mercedes brand average of 87%, the SL 400 Grand Edition Auto performs 4 points better, making it one of the more reliable options in the Mercedes range.
Estimated Running Costs
Based on 7,400 miles/year, average pump prices of 174.57p petrol and 199.33p diesel (GOV.UK weekly road fuel prices, week of 19 October 2026), and MOT pass rate data. Insurance not included.
Full 2021 detailsHow reliable is the Mercedes SL 400 Grand Edition Auto?
Mercedes SL 400 Grand Edition Auto by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
Questions about the Mercedes SL 400 Grand Edition Auto
Is the Mercedes SL 400 Grand Edition Auto reliable?
Across its 2 model years in our data (2020 to 2021), the Mercedes SL 400 Grand Edition Auto averages a 91% MOT pass rate, from 147 tests (DVSA MOT data for tests in 2024, retests included). That's 9 points above the average of 82% across all models in the same data.
Mercedes SL 400 Grand Edition Auto Guides & Articles
Cars That Lose Value Fastest: Models to Avoid for Depreciation
8 min read
Running CostsCheapest Cars to Run in 2026: Running Costs From DVSA MOT Data
9 min read
Reliability20 Most Reliable Used Cars UK 2026: Real MOT Pass Rate Rankings
10 min read
Buying GuideFord Fiesta Common Problems (2026): What to Check Before Buying
13 min read
ReliabilityFord Puma Common Problems: 7 Issues That Could Cost £1,500+ (2026)
13 min read
Checking a specific Mercedes SL 400 Grand Edition Auto?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.