Mercedes S 350 Grand Ed Executive D A (2020)
Estimated running costs and MOT pass rates from 78 MOT tests in 2024.
Annual Cost
£2,131
£178/month
MOT Pass Rate
94%
Excellent
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 30-42
2925cc Diesel
Great Choice
94% pass rate, £2,131/year to run. 12 points above average.
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Annual Running Costs
~40 mpg
Standard rate (from April 2017)
Low estimate due to excellent reliability
Estimates based on 7,400 miles/year (UK average), diesel at 199.33p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).
Reliability Verdict
Excellent reliability. Very few MOT failures. That's 12 points above the average of 82% across all models in our data. It also outperforms the Mercedes brand average of 87%.
94% of MOT tests on Mercedes S 350 Grand Ed Executive D As from 2020 ended in a pass in 2024, when they were about 4 years old. That's based on 78 tests across the UK, retests included. The average mileage recorded at those tests was 40,407 miles.
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How Does It Compare?
Mileage Analysis
40,407
Average miles
29,600
Expected for age
The average 2020 Mercedes S 350 Grand Ed Executive D A had 40,407 miles on the clock at its 2024 MOT, which is above the expected 29,600 miles for a 4-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
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Mercedes S 350 Grand Ed Executive D A by Year
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About the 2020 Mercedes S 350 Grand Ed Executive D A
The 2020 Mercedes S 350 Grand Ed Executive D A is a premium performance car. Our records list a 2925cc diesel engine, though engines vary between versions. 78 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. Among all models from 2020, the average MOT pass rate is 92%, and this model beats that benchmark.
With an average of 40,407 miles recorded at its 2024 MOT tests, Mercedes S 350 Grand Ed Executive D A owners cover more miles than the average driver.
2020 Mercedes S 350 Grand Ed Executive D A 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 £1,676 per year with diesel at 199.33p per litre (GOV.UK weekly average, week of 19 October 2026; 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 2020 Mercedes S 350 Grand Ed Executive D A?
Total estimated annual running cost is £2,131 (£178/month), broken down as £1,676 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 94% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2020 Mercedes S 350 Grand Ed Executive D A
At 6 years old, the Mercedes S 350 Grand Ed Executive D 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 78 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.
DPF (Diesel Particulate Filter)
Watch outShort journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.
Turbo Wear
Medium riskDiesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.
AdBlue System
Medium riskPost-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.
EGR Valve
Watch outExhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.
Dual Mass Flywheel
Medium riskLarger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.
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 S 350 Grand Ed Executive D A stacks up against similar cars for estimated annual running costs, insurance group, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Est. Ins. Group | Total/yr |
|---|---|---|---|---|---|
| Mercedes S 350 Grand Ed Executive D A(2020) | 94% | £1,676 | £200 | Grp 30-42 | £2,131 |
| Mercedes E(2019) | 90% | £1,676 | £200 | Grp 30-42 | £2,131same |
| Mercedes GLC(2018) | 91% | £1,676 | £200 | Grp 30-42 | £2,131same |
| Ford Ranger(2019) | 87% | £1,676 | £200 | Grp 35-50 | £2,281+£150 |
| Land Rover Range Rover Velar(2018) | 91% | £1,676 | £200 | Grp 30-42 | £2,131same |
Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.
Questions about the 2020 Mercedes S 350 Grand Ed Executive D A
Is the 2020 Mercedes S 350 Grand Ed Executive D A reliable?
Excellent reliability. Very few MOT failures. 94% of MOT tests on 2020 Mercedes S 350 Grand Ed Executive D As ended in a pass, from 78 tests (DVSA MOT data for tests in 2024, retests included). That's 12 points above the average of 82% across all models in the same data.
How much does a 2020 Mercedes S 350 Grand Ed Executive D A cost to run?
Our estimate is £2,131 a year (£178 a month): £1,676 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.
What is the MOT pass rate for a 2020 Mercedes S 350 Grand Ed Executive D A?
94% of 78 MOT tests on the 2020 Mercedes S 350 Grand Ed Executive D A ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 857th of 2,554 models first registered in 2020 (top half).
What is the average mileage for a 2020 Mercedes S 350 Grand Ed Executive D A?
The average mileage recorded at MOT tests on the 2020 Mercedes S 350 Grand Ed Executive D A is 40,407 miles, which is above the expected 29,600 miles for a 4-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
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
Mercedes E
2019 · 2925cc Diesel
Mercedes GLC
2018 · 2987cc Diesel
Ford Ranger
2019 · 3198cc Diesel
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