MERCEDES GL (2020)
Running costs, reliability data, and common problems from 69 real MOT tests.
Annual Cost
£1,777
£148/month
MOT Pass Rate
100%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
2000cc Petrol
Great Choice
100% pass rate, £1777/year to run. 18 points above average.
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Annual Running Costs
~36 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
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
Excellent reliability. Very few MOT failures. That's 18 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 6 years old, 100% of MERCEDES GLs from 2020 passed their MOT first time in 2026. That's based on 69 tests across the UK. The average mileage at this age is 41,984 miles.
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How Does It Compare?
Mileage Analysis
41,984
Average miles
44,400
Expected for age
The average 2020 MERCEDES GL has 41,984 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 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
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About the 2020 MERCEDES GL
The 2020 MERCEDES GL is a family car with a 2000cc petrol engine. 69 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 1% of all 2020 cars for reliability.
With an average of 41,984 miles at 6 years old, MERCEDES GL owners drive about as much as the UK average.
2020 MERCEDES GL Fuel Costs
The 2000cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,327 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 GL?
Total estimated annual running cost is £1,777 (£148/month), broken down as £1327 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 100% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES GL Reliability Trend
Newer MERCEDES GLs show better MOT pass rates than older ones, with an average improvement of 9 percentage points.
Buying a Used 2020 MERCEDES GL
At 6 years old, the MERCEDES GL 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 69 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2020 MERCEDES GL's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 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 riskLarger 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 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 GL stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES GL(2020) | 100% | £1327 | £195 | Grp 18-32 | £1777 |
| NISSAN QASHQAI(2020) | 93% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| HYUNDAI TUCSON(2019) | 90% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| MERCEDES A(2021) | 94% | £1327 | £190 | Grp 18-32 | £1772-£5 |
| VOLVO XC40(2020) | 93% | £1327 | £190 | Grp 18-32 | £1772-£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.
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
NISSAN QASHQAI
2020 · 1598cc Petrol
HYUNDAI TUCSON
2019 · 1591cc Petrol
MERCEDES A
2021 · 1991cc Petrol
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