Mercedes S-Class (2014)

Estimated running costs and MOT pass rates from 3,915 MOT tests in 2024.

Annual Cost

£3,003

£250/month

MOT Pass Rate

92%

Excellent

Road Tax

£790

Estimated/year

Est. Insurance

Grp 35-50

3498cc Hybrid

Great Choice

92% pass rate, £3,003/year to run. 10 points above average.

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Hybrid3498cc12 years old3,915 tests96k miles avg

Annual Running Costs

Fuel (Hybrid, 3498cc)

~30 mpg (petrol-engine estimate; hybrids usually use less)

£1,958

Road Tax

Estimated CO2 band

£790

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£3,003

Per month£250/mo

Per week£58/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p 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.

Reliability Verdict

92% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 10 points above the average of 82% across all models in our data. It also outperforms the Mercedes brand average of 87%.

92% of MOT tests on Mercedes S-Classs from 2014 ended in a pass in 2024, when they were about 10 years old. That's based on 3,915 tests across the UK, retests included. The average mileage recorded at those tests was 95,545 miles.

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How Does It Compare?

Rank among 2014 models88th of 527(top 17%)

Rank among Mercedes models452nd of 1,376(top half)

vs average of all models+10%(82% avg)

vs 2014 models average+11%(81% avg)

vs Mercedes average+5%(87% avg)

Mileage Analysis

95,545

Average miles

74,000

Expected for age

The average 2014 Mercedes S-Class had 95,545 miles on the clock at its 2024 MOT, which is above the expected 74,000 miles for a 10-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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Best Year to Buy?

Of the years with at least 100 tests, the 2020 model has the highest MOT pass rate at 95%, while the 1992 model has the lowest at 72%. The 2014 scores 92%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

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

Lexus RX

2014 · 3456cc Hybrid

£3,003/year

91%

-1%

Lexus RX450H

2012 · 3456cc Hybrid

£3,153/year

87%

-5%

Lexus RX 450H Luxury CVT

2013 · 3456cc Hybrid

£3,003/year

90%

-2%

Lexus GS

2016 · 3456cc Hybrid

£3,003/year

94%

+2%

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About the 2014 Mercedes S-Class

The 2014 Mercedes S-Class is a premium performance car. Our records list a 3498cc hybrid engine, though engines vary between versions. 3,915 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. It ranks in the top 17% of all 2014 models for MOT pass rate.

With an average of 95,545 miles recorded at its 2024 MOT tests, Mercedes S-Class owners cover more miles than the average driver.

2014 Mercedes S-Class Fuel Costs

The 3498cc hybrid engine is on the larger side, so fuel won't be this car's strong point. Our estimate uses around 30 mpg, the figure for a petrol engine of this size, which works out to roughly £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year). As a hybrid it should use less than that, and real-world fuel costs depend a lot on how much electric-only driving you do.

What does it cost to own a 2014 Mercedes S-Class?

Total estimated annual running cost is £3,003 (£250/month), broken down as £1,958 fuel, £790 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

Mercedes S-Class Reliability Trend

Newer Mercedes S-Classs pass their MOT more often than older ones, by 6 percentage points on average, which is mostly down to age and wear.

Buying a Used 2014 Mercedes S-Class

At 12 years old, the Mercedes S-Class is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2020 model has the highest pass rate at 95%.

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.

Hybrid Battery Health

Watch out

After 12 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.

Inverter and Power Electronics

Medium risk

The inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.

Regenerative Braking

Medium risk

Brake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

Clutch Wear

Medium risk

With an average of 96k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.

Brake Discs and Pads

Medium risk

High-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.

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 2014 Mercedes S-Class 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-Class(2014)	92%	£1,958	£790	Grp 35-50	£3,003
Lexus RX(2014)	91%	£1,958	£790	Grp 35-50	£3,003same
Lexus RX450H(2012)	87%	£1,958	£790	Grp 35-50	£3,153+£150
Lexus RX 450H Luxury CVT(2013)	90%	£1,958	£790	Grp 35-50	£3,003same
Lexus GS(2016)	94%	£1,958	£790	Grp 35-50	£3,003same

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 2014 Mercedes S-Class

Is the 2014 Mercedes S-Class reliable?

Excellent reliability. Very few MOT failures. 92% of MOT tests on 2014 Mercedes S-Classs ended in a pass, from 3,915 tests (DVSA MOT data for tests in 2024, retests included). That's 10 points above the average of 82% across all models in the same data.

How much does a 2014 Mercedes S-Class cost to run?

Our estimate is £3,003 a year (£250 a month): £1,958 fuel, £790 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 2014 Mercedes S-Class?

92% of 3,915 MOT tests on the 2014 Mercedes S-Class ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 88th of 527 models first registered in 2014 (top 17%).

Which year Mercedes S-Class has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 Mercedes S-Class has the highest MOT pass rate at 95% and the 1992 the lowest at 72%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2014 Mercedes S-Class?

The average mileage recorded at MOT tests on the 2014 Mercedes S-Class is 95,545 miles, which is above the expected 74,000 miles for a 10-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.