Mercedes-Benz GLS-Class — All Years
We have Mercedes-Benz GLS-Class specifications on file for 10 model years, 2017–2026, covering suv trims. Across those years EPA data lists 5 different engines. Combined fuel economy runs from 17 to 25 mpg (UK) depending on year, engine and transmission. Select a year below for full engine, fuel economy, dimensions and safety data.
| Year | Engine(s) | Fuel | MPG (UK) | CO₂ g/km | NHTSA | Recalls | Complaints |
|---|---|---|---|---|---|---|---|
| 2026 | 3L 6-cyl twin-charged / 4L 8-cyl turbo | Premium Gasoline | 20–25 | 266 | — | — | — |
| 2025 | 3L 6-cyl twin-charged / 4L 8-cyl turbo | Premium Gasoline | 18–25 | 266 | — | — | — |
| 2024 | 3L 6-cyl turbo / 4L 8-cyl turbo | Premium Gasoline | 19–25 | 266 | — | — | — |
| 2023 | 3L 6-cyl turbo / 4L 8-cyl turbo | Premium Gasoline | 19–24 | 269 | — | 0 | 10 |
| 2022 | 3L 6-cyl turbo / 4L 8-cyl turbo | Premium Gasoline | 18–24 | 269 | — | 0 | 16 |
| 2021 | 3L 6-cyl turbo / 4L 8-cyl turbo | Premium Gasoline | 19–25 | 257 | — | 0 | 37 |
| 2020 | 3L 6-cyl turbo / 4L 8-cyl turbo | Premium Gasoline | 22–25 | 267 | — | 0 | 38 |
| 2019 | 3L 6-cyl turbo / 4.7L 8-cyl turbo / 5.5L 8-cyl turbo | Premium Gasoline | 18–22 | 303 | — | 0 | 28 |
| 2018 | 3L 6-cyl turbo / 4.7L 8-cyl turbo / 5.5L 8-cyl turbo | Premium Gasoline | 18–23 | 296 | — | 0 | 22 |
| 2017 | 3L 6-cyl turbo / 4.7L 8-cyl turbo / 5.5L 8-cyl turbo | Premium Gasoline | 17–23 | 296 | — | 0 | 42 |
Best and Worst Mercedes-Benz GLS-Class Years: What the NHTSA Data Shows
Across the 6 Mercedes-Benz GLS-Class model years from 2017 to 2022 that have NHTSA data, the typical year has about 32 owner complaints on file. These are the extremes:
Fewest owner complaints
Complaint counts are unverified owner reports to NHTSA and rise with how many cars were sold and how long they have been on the road, so treat them as a pointer for what to inspect, not a reliability score. Model years after 2022 are left out because they have had little time to accumulate reports. Always check a specific car by VIN at nhtsa.gov/recalls.
Engine History
- 3L 6-cyl turbo — 2017–2024
- 4.7L 8-cyl turbo — 2017–2019
- 5.5L 8-cyl turbo — 2017–2019
- 4L 8-cyl turbo — 2020–2026
- 3L 6-cyl twin-charged — 2025–2026
Engines are those EPA lists for each model year; the MPG (UK) column shows the range across configurations where more than one exists.
Frequently Asked Questions
What years is the Mercedes-Benz GLS-Class covered on this site?
We have data for 10 model years of the Mercedes-Benz GLS-Class, from 2017 to 2026.
What engines does the Mercedes-Benz GLS-Class come with?
EPA data lists: 3L 6-cyl turbo (2017–2024); 4.7L 8-cyl turbo (2017–2019); 5.5L 8-cyl turbo (2017–2019); 4L 8-cyl turbo (2020–2026); 3L 6-cyl twin-charged (2025–2026).
Which Mercedes-Benz GLS-Class year has the best fuel economy?
The 2026 model returns the highest combined MPG (UK) on record here, at 25 mpg on its most efficient configuration.
Does the Mercedes-Benz GLS-Class have a 5-star NHTSA safety rating?
No model year of this car currently has a 5-star overall NHTSA rating on record here — check the individual year pages above for the exact rating available.
Which Mercedes-Benz GLS-Class model years have the most recalls and complaints?
NHTSA lists no recalls for 2017–2023. Counts are from NHTSA as of 6 October 2026 and change over time; complaints are unverified owner reports.
What body style is the Mercedes-Benz GLS-Class?
The Mercedes-Benz GLS-Class is classed as an SUV on this site.
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