MERCEDES SL 500 GRAND EDITION PREMIUM A (2020)
Running costs, reliability data, and common problems from 83 real MOT tests.
Annual Cost
£2,042
£170/month
MOT Pass Rate
100%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 35-50
4663cc Petrol
Great Choice
100% pass rate, £2042/year to run. 18 points above average.
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Annual Running Costs
~30 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 18 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 6 years old, 100% of MERCEDES SL 500 GRAND EDITION PREMIUM As from 2020 passed their MOT first time in 2026. That's based on 83 tests across the UK. The average mileage at this age is 14,757 miles.
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How Does It Compare?
Mileage Analysis
14,757
Average miles
44,400
Expected for age
The average 2020 MERCEDES SL 500 GRAND EDITION PREMIUM A has 14,757 miles on the clock, which is significantly below the expected 44,400 miles for a 6-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 SL 500 GRAND EDITION PREMIUM A by Year
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About the 2020 MERCEDES SL 500 GRAND EDITION PREMIUM A
The 2020 MERCEDES SL 500 GRAND EDITION PREMIUM A is a performance with a 4663cc petrol engine. 83 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 0% of all 2020 cars for reliability.
With an average of 14,757 miles at 6 years old, MERCEDES SL 500 GRAND EDITION PREMIUM A 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.
2020 MERCEDES SL 500 GRAND EDITION PREMIUM A Fuel Costs
The 4663cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2020 MERCEDES SL 500 GRAND EDITION PREMIUM A?
Total estimated annual running cost is £2,042 (£170/month), broken down as £1592 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 100% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2020 MERCEDES SL 500 GRAND EDITION PREMIUM A
At 6 years old, the MERCEDES SL 500 GRAND EDITION PREMIUM 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 83 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2020 MERCEDES SL 500 GRAND EDITION PREMIUM A's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 6 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.
Oil Consumption
Low riskLarger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.
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 2020 MERCEDES SL 500 GRAND EDITION PREMIUM A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES SL 500 GRAND EDITION PREMIUM A(2020) | 100% | £1592 | £195 | Grp 35-50 | £2042 |
| JAGUAR F-TYPE(2018) | 95% | £1592 | £190 | Grp 35-50 | £2037-£5 |
| LAND ROVER RANGE ROVER SPRT SVR CRBN ED A(2021) | 96% | £1592 | £190 | Grp 35-50 | £2037-£5 |
| TOYOTA LAND CRUISER(2019) | 93% | £1592 | £190 | Grp 35-50 | £2037-£5 |
| BMW X5 M COMPETITION AUTO(2021) | 95% | £1592 | £190 | Grp 35-50 | £2037-£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.
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