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

Estimated annual running cost is £2,042 (£170/month), including £1592 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2020 MERCEDES S-CLASS?

The 2020 MERCEDES S-CLASS has a 95% MOT pass rate based on 540 tests in 2026. This ranks 507 out of 2596 cars from 2020.

Which year MERCEDES S-CLASS is most reliable?

The 2020 MERCEDES S-CLASS has the highest MOT pass rate at 95%. The least reliable year is 1992 at 72%.

What is the average mileage for a 2020 MERCEDES S-CLASS?

The average mileage for a 2020 MERCEDES S-CLASS is 43,972 miles, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.

MERCEDES S-CLASS (2020)

Q: Is the 2020 MERCEDES S-CLASS reliable?

Excellent reliability. Very few MOT failures. 95% of MERCEDES S-CLASSs from 2020 passed their MOT first time in 2026, based on 540 tests. That's 13 points above the national average of 82%.

Running costs, reliability data, and common problems from 540 real MOT tests.

Annual Cost

£2,042

£170/month

MOT Pass Rate

95%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 35-50

3982cc Petrol

Great Choice

95% pass rate, £2042/year to run. 13 points above average.

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Petrol3982cc6 years old540 tests44k miles avg

Annual Running Costs

Fuel (Petrol, 3982cc)

~30 mpg

£1,592

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,042

Per month£170/mo

Per week£39/wk

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

95% MOT pass rate(Excellent)

0%National avg: 82%100%

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 6 years old, 95% of MERCEDES S-CLASSs from 2020 passed their MOT first time in 2026. That's based on 540 tests across the UK. The average mileage at this age is 43,972 miles.

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How Does It Compare?

Rank among 2020 cars507th of 2,596(top 20%)

Rank among MERCEDES models237th 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

43,972

Average miles

44,400

Expected for age

The average 2020 MERCEDES S-CLASS has 43,972 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.

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MERCEDES S-CLASS by Year

Year	Pass Rate	Tests	Avg Mileage
2021	91%	164	32,036 mi
2020	95%	540	43,972 mi
2019	94%	5,921	67,860 mi
2018	94%	6,518	75,456 mi
2017	93%	5,990	73,988 mi
2016	91%	6,819	74,260 mi
2015	92%	5,513	87,325 mi
2014	92%	3,915	95,545 mi
2013	89%	2,145	108,065 mi
2012	88%	2,817	100,420 mi
2011	87%	2,202	117,628 mi
2010	85%	2,001	110,934 mi
2009	82%	1,990	114,274 mi
2008	84%	2,232	110,584 mi
2007	84%	2,940	117,418 mi
2006	87%	2,334	111,043 mi
2005	84%	1,301	132,014 mi
2004	82%	1,158	124,020 mi
2003	82%	1,227	120,882 mi
2002	79%	720	115,052 mi
2001	79%	735	107,381 mi
2000	81%	562	102,703 mi
1999	78%	434	98,447 mi
1998	81%	522	111,371 mi
1997	86%	373	107,182 mi
1996	83%	348	109,185 mi
1995	86%	286	111,087 mi
1994	92%	140	106,787 mi
1993	76%	49	112,335 mi
1992	72%	121	119,350 mi
1991	92%	118	120,508 mi
1990	87%	125	142,121 mi

Similar Cars to Consider

MERCEDES C

2019 · 3982cc Petrol

£2,037/year

91%

-4%

PORSCHE CAYENNE

2019 · 3996cc Petrol

£2,037/year

95%

same

PORSCHE 911

2018 · 3996cc Petrol

£2,037/year

96%

+1%

AUDI A6

2020 · 3996cc Petrol

£2,037/year

94%

-1%

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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 2026, 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 6 years old, MERCEDES S-CLASS owners drive about as much as the UK average.

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 £2,042 (£170/month), broken down as £1592 fuel, £195 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 6 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.

Common Issues to Watch For

Based on the 2020 MERCEDES S-CLASS's fuel type, age, and engine size, these are the most likely problem areas to check.

Timing Chain / Belt

Watch out

At 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 risk

Larger 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 risk

Always 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-CLASS stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES S-CLASS(2020)	95%	£1592	£195	Grp 35-50	£2042
MERCEDES C(2019)	91%	£1592	£190	Grp 35-50	£2037-£5
PORSCHE CAYENNE(2019)	95%	£1592	£190	Grp 35-50	£2037-£5
PORSCHE 911(2018)	96%	£1592	£190	Grp 35-50	£2037-£5
AUDI A6(2020)	94%	£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.