MERCEDES GL (2018)
Running costs, common problems, and reliability data based on 63 real MOT tests in 2024.
MOT Pass Rate
95%
Total Tests (2024)
63
Avg Mileage
38,524 mi
Est. Annual Cost
£2,037
Is the 2018 MERCEDES GL 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 6 years old, 95% of MERCEDES GLs from 2018 passed their MOT first time in 2024. That's based on 63 tests across the UK. The average mileage at this age is 38,524 miles.
How does the 2018 MERCEDES GL compare?
Mileage Analysis
The average 2018 MERCEDES GL has 38,524 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
Best year to buy a MERCEDES GL?
The most reliable year is the 2020 model with a 100% MOT pass rate, while the 2006 model has the lowest at 78%. The 2018 sits between the two at 95%.
How much does a 2018 MERCEDES GL cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
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 |
Checking a specific MERCEDES GL?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 MERCEDES GL
The 2018 MERCEDES GL is a performance with a 5461cc petrol engine. 63 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It ranks in the top 19% of all 2018 cars for reliability.
With an average of 38,524 miles at 6 years old, MERCEDES GL owners drive about as much as the UK average.
2018 MERCEDES GL Fuel Costs
The 5461cc 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 2018 MERCEDES GL?
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 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 2018 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. If you're flexible on year, the 2020 model has the highest pass rate at 100%. Note: with only 63 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 2018 MERCEDES GL
The MERCEDES GL is actually the most reliable option among similar petrol performances from this era. Here are comparable petrol cars with similar engines:
- LAND ROVER RANGE ROVER (2017) 91% pass rate (-4%) from 16,007 tests
- MERCEDES S-CLASS (2017) 93% pass rate (-2%) from 5,990 tests
- JAGUAR F-TYPE (2017) 94% pass rate (-1%) from 5,380 tests
- MERCEDES SLK (2016) 89% pass rate (-6%) from 2,572 tests