MERCEDES GLS 400 AMG LN PREM + D 4MAT A (2020)
Running costs, common problems, and reliability data based on 477 real MOT tests in 2024.
MOT Pass Rate
92%
Total Tests (2024)
477
Avg Mileage
44,512 mi
Est. Annual Cost
£1,690
Is the 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A reliable?
Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 4 years old, 92% of MERCEDES GLS 400 AMG LN PREM + D 4MAT As from 2020 passed their MOT first time in 2024. That's based on 477 tests across the UK. The average mileage at this age is 44,512 miles.
How does the 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A compare?
Mileage Analysis
The average 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A has 44,512 miles on the clock, which is well above the expected 29,600 miles for a 4-year-old car. Check service history carefully, as high-mileage cars need consistent maintenance to stay reliable.
Best year to buy a MERCEDES GLS 400 AMG LN PREM + D 4MAT A?
The most reliable year is the 2019 model with a 99% MOT pass rate, while the 2021 model has the lowest at 90%. The 2020 sits between the two at 92%.
How much does a 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A 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 GLS 400 AMG LN PREM + D 4MAT A by Year
Checking a specific MERCEDES GLS 400 AMG LN PREM + D 4MAT A?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A
The 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A is a large car with a 2925cc diesel engine. 477 of these vehicles were MOT tested in 2024, making it a less common model in the UK market. Among all cars from 2020, the average MOT pass rate is 92%, and this model falls short of that benchmark.
With an average of 44,512 miles at 4 years old, MERCEDES GLS 400 AMG LN PREM + D 4MAT A owners cover more miles than the average driver. High-mileage examples should be checked carefully for wear on suspension, brakes, and drivetrain components.
2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A Fuel Costs
The 2925cc 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 GLS 400 AMG LN PREM + D 4MAT A?
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 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES GLS 400 AMG LN PREM + D 4MAT A Reliability Trend
Older MERCEDES GLS 400 AMG LN PREM + D 4MAT As tend to have better MOT pass rates than newer ones, with an average decline of 8 percentage points across model years.
Buying a Used 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A
At 4 years old, the MERCEDES GLS 400 AMG LN PREM + D 4MAT A 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 2019 model has the highest pass rate at 99%.
Alternatives to the 2020 MERCEDES GLS 400 AMG LN PREM + D 4MAT A
The MERCEDES GLS 400 AMG LN PREM + D 4MAT A 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 (-2%) from 41,000 tests
- MERCEDES GLC (2018) 91% pass rate (-1%) from 40,494 tests
- FORD RANGER (2019) 87% pass rate (-5%) from 32,194 tests
- LAND ROVER RANGE ROVER VELAR (2018) 91% pass rate (-1%) from 29,640 tests