Mercedes GL (2015)

Estimated running costs and MOT pass rates from 1,283 MOT tests in 2024.

Annual Cost

£2,491

£208/month

MOT Pass Rate

89%

Good

Road Tax

£410

Estimated/year

Est. Insurance

Grp 30-42

2987cc Diesel

Solid Option

89% pass rate, £2,491/year to run. 7 points above average.

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Diesel2987cc11 years old1,283 tests79k miles avg

Annual Running Costs

Fuel (Diesel, 2987cc)

~40 mpg

£1,676

Road Tax

Estimated CO2 band

£410

MOT Test

£55

Predicted Repairs

£350

Total per year£2,491

Per month£208/mo

Per week£48/wk

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.

Reliability Verdict

89% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's 7 points above the average of 82% across all models in our data.

89% of MOT tests on Mercedes GLs from 2015 ended in a pass in 2024, when they were about 9 years old. That's based on 1,283 tests across the UK, retests included. The average mileage recorded at those tests was 79,394 miles.

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How Does It Compare?

Rank among 2015 models171st of 515(top half)

Rank among Mercedes models687th of 1,376(top half)

vs average of all models+7%(82% avg)

vs 2015 models average+6%(83% avg)

vs Mercedes average+2%(87% avg)

Mileage Analysis

79,394

Average miles

66,600

Expected for age

The average 2015 Mercedes GL had 79,394 miles on the clock at its 2024 MOT, which is in line with the expected 66,600 miles for a 9-year-old car, suggesting normal everyday use.

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Best Year to Buy?

Of the years with at least 100 tests, the 2019 model has the highest MOT pass rate at 93%, while the 2006 model has the lowest at 78%. The 2015 scores 89%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Mercedes GL by Year

Year	Pass Rate	Tests	Avg Mileage
2021	99%	71	29,185 mi
2020	100%	69	41,984 mi
2019	93%	137	35,018 mi
2018	95%	63	38,524 mi
2017	79%	47	108,751 mi
2016	88%	475	73,156 mi
2015	89%	1,283	79,394 mi
2014	92%	1,321	93,766 mi
2013	90%	1,304	103,757 mi
2012	89%	225	99,410 mi
2011	86%	609	116,582 mi
2010	89%	435	121,550 mi
2009	81%	224	126,000 mi
2008	84%	371	122,229 mi
2007	85%	572	130,779 mi
2006	78%	160	123,042 mi

Similar Cars to Consider

Audi A5

2017 · 2967cc Diesel

£2,281/year

89%

same

Mercedes GLC

2017 · 2987cc Diesel

£2,131/year

90%

+1%

Land Rover Range Rover

2013 · 2926cc Diesel

£2,491/year

88%

-1%

Jaguar XF

2014 · 2993cc Diesel

£2,491/year

84%

-5%

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About the 2015 Mercedes GL

The 2015 Mercedes GL is a premium performance car. Our records list a 2987cc diesel engine, though engines vary between versions. 1,283 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. Among all models from 2015, the average MOT pass rate is 83%, and this model beats that benchmark.

With an average of 79,394 miles recorded at its 2024 MOT tests, Mercedes GL owners drive about as much as the UK average.

2015 Mercedes GL Fuel Costs

The 2987cc 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 2015 Mercedes GL?

Total estimated annual running cost is £2,491 (£208/month), broken down as £1,676 fuel, £410 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 89% pass rate. Keeping on top of servicing will help avoid surprises.

Mercedes GL Reliability Trend

Newer Mercedes GLs 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 2015 Mercedes GL

At 11 years old, the Mercedes GL 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 2019 model has the highest pass rate at 93%.

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 out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Watch out

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Watch out

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

Dual Mass Flywheel

Watch out

Larger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.

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.

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 2015 Mercedes GL 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 GL(2015)	89%	£1,676	£410	Grp 30-42	£2,491
Audi A5(2017)	89%	£1,676	£200	Grp 30-42	£2,281-£210
Mercedes GLC(2017)	90%	£1,676	£200	Grp 30-42	£2,131-£360
Land Rover Range Rover(2013)	88%	£1,676	£410	Grp 30-42	£2,491same
Jaguar XF(2014)	84%	£1,676	£410	Grp 30-42	£2,491same

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 2015 Mercedes GL

Is the 2015 Mercedes GL reliable?

Good reliability. Occasional issues but generally solid. 89% of MOT tests on 2015 Mercedes GLs ended in a pass, from 1,283 tests (DVSA MOT data for tests in 2024, retests included). That's 7 points above the average of 82% across all models in the same data.

How much does a 2015 Mercedes GL cost to run?

Our estimate is £2,491 a year (£208 a month): £1,676 fuel, £410 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2015 Mercedes GL?

89% of 1,283 MOT tests on the 2015 Mercedes GL ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 171st of 515 models first registered in 2015 (top half).

Which year Mercedes GL has the best MOT pass rate?

Of the years with at least 100 tests, the 2019 Mercedes GL has the highest MOT pass rate at 93% and the 2006 the lowest at 78%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2015 Mercedes GL?

The average mileage recorded at MOT tests on the 2015 Mercedes GL is 79,394 miles, which is in line with the expected 66,600 miles for a 9-year-old car, suggesting normal everyday use.