MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A (2021)
Running costs, reliability data, and common problems from 73 real MOT tests.
Annual Cost
£2,192
£183/month
MOT Pass Rate
89%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 35-50
3982cc Hybrid
Solid Option
89% pass rate, £2192/year to run. 7 points above average.
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Annual Running Costs
~30 mpg
Flat rate (post-2017)
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
Good reliability. Occasional issues but generally solid. That's 7 points above the national average of 82%.
At 5 years old, 89% of MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ As from 2021 passed their MOT first time in 2026. That's based on 73 tests across the UK. The average mileage at this age is 20,552 miles.
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How Does It Compare?
Mileage Analysis
20,552
Average miles
37,000
Expected for age
The average 2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A has 20,552 miles on the clock, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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About the 2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A
The 2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A is a performance with a 3982cc hybrid engine. 73 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 82% of 2021 cars for MOT pass rates.
With an average of 20,552 miles at 5 years old, MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A owners tend to use this car less than the typical driver.
2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A Fuel Costs
The 3982cc hybrid 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 hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.
What does it cost to own a 2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A?
Total estimated annual running cost is £2,192 (£183/month), broken down as £1592 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 89% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A
At 5 years old, the MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A 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 73 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Medium riskAfter 5 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Low riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Medium riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
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 2021 MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES AMG GLS 63 NIGHT ED MHEV 4M+ A(2021) | 89% | £1592 | £195 | Grp 35-50 | £2192 |
| PORSCHE PANAMERA(2020) | 95% | £1592 | £190 | Grp 35-50 | £2037-£155 |
| FERRARI SF90 STRADALE S-A(2021) | 99% | £1592 | £190 | Grp 35-50 | £2037-£155 |
| FERRARI SF90 ASSETTO FIORANO S-A(2021) | 99% | £1592 | £190 | Grp 35-50 | £2037-£155 |
| MERCEDES AMG GLS 63 NT ED EXEC MHEV4M+A(2021) | 94% | £1592 | £190 | Grp 35-50 | £2037-£155 |
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
PORSCHE PANAMERA
2020 · 3996cc Hybrid
FERRARI SF90 STRADALE S-A
2021 · 3990cc Hybrid
FERRARI SF90 ASSETTO FIORANO S-A
2021 · 3990cc Hybrid
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