MERCEDES G (2020)
Running costs, common problems, and reliability data based on 1,447 real MOT tests in 2024.
MOT Pass Rate
96%
Total Tests (2024)
1,447
Avg Mileage
34,014 mi
Est. Annual Cost
£1,690
Is the 2020 MERCEDES G reliable?
Excellent reliability. Very few MOT failures. That's 14 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 4 years old, 96% of MERCEDES Gs from 2020 passed their MOT first time in 2024. That's based on 1,447 tests across the UK. The average mileage at this age is 34,014 miles.
How does the 2020 MERCEDES G compare?
Mileage Analysis
The average 2020 MERCEDES G has 34,014 miles on the clock, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.
Best year to buy a MERCEDES G?
The most reliable year is the 2018 model with a 98% MOT pass rate, while the 2019 model has the lowest at 93%. The 2020 sits between the two at 96%.
How much does a 2020 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 2020 MERCEDES G
The 2020 MERCEDES G is a large car with a 2999cc diesel engine. 1,447 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. It ranks in the top 12% of all 2020 cars for reliability.
With an average of 34,014 miles at 4 years old, MERCEDES G owners drive about as much as the UK average.
2020 MERCEDES G Fuel Costs
The 2999cc 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 £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year).
What does it cost to own a 2020 MERCEDES G?
Total estimated annual running cost is £1,690 (£141/month), broken down as £1245 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 96% 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 2020 MERCEDES G
At 4 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. If you're flexible on year, the 2018 model has the highest pass rate at 98%.
Alternatives to the 2020 MERCEDES G
The MERCEDES G is actually the most reliable option among similar diesel large cars from this era. Here are comparable diesel cars with similar engines:
- MERCEDES E (2019) 90% pass rate (-6%) from 41,000 tests
- MERCEDES GLC (2018) 91% pass rate (-5%) from 40,494 tests
- FORD RANGER (2019) 87% pass rate (-9%) from 32,194 tests
- LAND ROVER RANGE ROVER VELAR (2018) 91% pass rate (-5%) from 29,640 tests