MERCEDES G (2018)
Running costs, common problems, and reliability data based on 109 real MOT tests in 2024.
MOT Pass Rate
98%
Total Tests (2024)
109
Avg Mileage
33,847 mi
Est. Annual Cost
£2,037
Is the 2018 MERCEDES G reliable?
Excellent reliability. Very few MOT failures. That's 16 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 6 years old, 98% of MERCEDES Gs from 2018 passed their MOT first time in 2024. That's based on 109 tests across the UK. The average mileage at this age is 33,847 miles.
How does the 2018 MERCEDES G compare?
Mileage Analysis
The average 2018 MERCEDES G has 33,847 miles on the clock, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.
How much does a 2018 MERCEDES G 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 G by Year
Checking a specific MERCEDES G?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 MERCEDES G
The 2018 MERCEDES G is a performance with a 3982cc petrol engine. 109 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It ranks in the top 6% of all 2018 cars for reliability.
With an average of 33,847 miles at 6 years old, MERCEDES G owners tend to use this car less than the typical driver.
2018 MERCEDES G 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 2018 MERCEDES G?
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 98% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES G Reliability Trend
The MERCEDES G has maintained consistent MOT pass rates across model years, varying by only 1 percentage points.
Buying a Used 2018 MERCEDES G
At 6 years old, the MERCEDES G offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.
Alternatives to the 2018 MERCEDES G
The MERCEDES G is actually the most reliable option among similar petrol performances from this era. Here are comparable petrol cars with similar engines:
- MERCEDES C (2016) 88% pass rate (-10%) from 80,181 tests
- AUDI A6 (2016) 89% pass rate (-9%) from 26,437 tests
- PORSCHE CAYENNE (2019) 95% pass rate (-3%) from 9,063 tests
- PORSCHE 911 (2018) 96% pass rate (-2%) from 7,623 tests