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MERCEDES S-CLASS (2020)

Running costs, common problems, and reliability data based on 540 real MOT tests in 2024.

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MOT Pass Rate

95%

Total Tests (2024)

540

Avg Mileage

43,972 mi

Est. Annual Cost

£2,037

Is the 2020 MERCEDES S-CLASS reliable?

Excellent reliability. Very few MOT failures. That's 13 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.

At 4 years old, 95% of MERCEDES S-CLASSs from 2020 passed their MOT first time in 2024. That's based on 540 tests across the UK. The average mileage at this age is 43,972 miles.

How does the 2020 MERCEDES S-CLASS compare?

Rank among all 2020 cars507th out of 2,596(top 20%)
Rank among all MERCEDES models237th out of 1,408(top 17%)
vs national average+13% (82% avg)
vs 2020 cars average+3% (92% avg)
vs MERCEDES average+8% (87% avg)

Mileage Analysis

The average 2020 MERCEDES S-CLASS has 43,972 miles on the clock, 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.

How much does a 2020 MERCEDES S-CLASS cost to run?

⛽Fuel (Petrol, 3982cc)
£1,592
🏛️Road Tax
£190
🔧MOT Test
£55
🛠️Predicted Repairs
£200
Total per year£2,037
Per month£170/mo

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.

MERCEDES S-CLASS by Year

YearPass RateTestsAvg Mileage
202191%16432,036 mi
202095%54043,972 mi
201994%5,92167,860 mi
201894%6,51875,456 mi
201793%5,99073,988 mi
201691%6,81974,260 mi
201592%5,51387,325 mi
201492%3,91595,545 mi
201389%2,145108,065 mi
201288%2,817100,420 mi
201187%2,202117,628 mi
201085%2,001110,934 mi
200982%1,990114,274 mi
200884%2,232110,584 mi
200784%2,940117,418 mi
200687%2,334111,043 mi
200584%1,301132,014 mi
200482%1,158124,020 mi
200382%1,227120,882 mi
200279%720115,052 mi
200179%735107,381 mi
200081%562102,703 mi
199978%43498,447 mi
199881%522111,371 mi
199786%373107,182 mi
199683%348109,185 mi
199586%286111,087 mi
199492%140106,787 mi
199376%49112,335 mi
199272%121119,350 mi
199192%118120,508 mi
199087%125142,121 mi

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About the 2020 MERCEDES S-CLASS

The 2020 MERCEDES S-CLASS is a performance with a 3982cc petrol engine. 540 of these vehicles were MOT tested in 2024, making it a less common model in the UK market. It ranks in the top 20% of all 2020 cars for reliability.

With an average of 43,972 miles at 4 years old, MERCEDES S-CLASS owners cover more miles than the average driver.

2020 MERCEDES S-CLASS Fuel Costs

The 3982cc 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 S-CLASS?

Total estimated annual running cost is £2,037 (£170/month), broken down as £1592 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

MERCEDES S-CLASS Reliability Trend

Newer MERCEDES S-CLASSs show better MOT pass rates than older ones, with an average improvement of 6 percentage points.

Buying a Used 2020 MERCEDES S-CLASS

At 4 years old, the MERCEDES S-CLASS offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.

Alternatives to the 2020 MERCEDES S-CLASS

If reliability is your priority, there's one similar car with a higher MOT pass rate. Here are comparable petrol cars with similar engines: